1. What is database tuning? Explain some of the tuning methods used by DBAs to improve performance.
2. What types of things affect performance of a database? Explain how those things are identified and managed.
3. Explain database statistics and why they are important. How do you obtain database statistics?

The angle measure of x, considering the trigonometric ratios, is given as follows:

x = 36.87º.

The three trigonometric ratios are the sine, the cosine and the tangent, and they are defined as follows:

For angle x, the parameters are given as follows:

Hence the value of x is obtained as follows:

sin(x) = 3/5

x = arcsin(3/5)

x = 36.87º.

More can be learned about trigonometric ratios at brainly.com/question/24349828

#SPJ1

(a) Forecast: Linear regression  the next year is approx 191.6007.

(b) MSE: Mean Squared Error is approximately 249.1585.

(c) MAPE: Mean Absolute Percent Error is approximately 10.42%.

(a) (a) Forecast using linear regression:
To forecast the number of disk drives for the next year, we can use linear regression to fit a line to the given data points. The linear regression equation is of the form y = mx + b, where y represents the number of disk drives and x represents the year.

Calculating the slope (m):
m = (Σ(xy) - n(Σx)(Σy)) / (Σ(x^2) - n(Σx)^2)

Σ(xy) = (1)(140) + (2)(160) + (3)(190) + (4)(200) + (5)(210) = 2820
Σ(x) = 1 + 2 + 3 + 4 + 5 = 15
Σ(y) = 140 + 160 + 190 + 200 + 210 = 900
Σ(x^2) = (1^2) + (2^2) + (3^2) + (4^2) + (5^2) = 55

m = (2820 - 5(15)(900)) / (55 - 5(15)^2)
m = (2820 - 6750) / (55 - 1125)
m = -3930 / -1070
m ≈ 3.6729

Calculating the y-intercept (b):
b = (Σy - m(Σx)) / n
b = (900 - 3.6729(15)) / 5
b = (900 - 55.0935) / 5
b ≈ 168.1813

Using the equation y = 3.6729x + 168.1813, where x represents the year, we can predict the number of disk drives for the next year. To do so, we substitute the value of x as the next year in the equation. Let's assume the next year is represented by x = 6:

y = 3.6729(6) + 168.1813
y ≈ 191.6007

Therefore, according to the linear regression model, the predicted number of disk drives for the next year is approximately 191.6007.

(b) Calculation of Mean Squared Error (MSE):

To calculate the Mean Squared Error (MSE), we need to compare the predicted values obtained from linear regression with the actual values given in the data.

First, we calculate the predicted values using the linear regression equation: y = 3.6729x + 168.1813, where x represents the year.

Predicted values:

Year 1: y = 3.6729(1) + 168.1813 = 171.8542
Year 2: y = 3.6729(2) + 168.1813 = 175.5271
Year 3: y = 3.6729(3) + 168.1813 = 179.2000
Year 4: y = 3.6729(4) + 168.1813 = 182.8729
Year 5: y = 3.6729(5) + 168.1813 = 186.5458
Next, we calculate the squared difference between the predicted and actual values, and then take the average:

MSE = (Σ(y - ŷ)^2) / n

MSE = ((140 - 171.8542)^2 + (160 - 175.5271)^2 + (190 - 179.2000)^2 + (200 - 182.8729)^2 + (210 - 186.5458)^2) / 5

MSE ≈ 249.1585

The Mean Squared Error (MSE) for the linear regression model is approximately 249.1585.

This value represents the average squared difference between the predicted values and the actual values, providing a measure of the accuracy of the model.

(c) Calculation of Mean Absolute Percent Error (MAPE):

To calculate the Mean Absolute Percent Error (MAPE), we need to compare the predicted values obtained from linear regression with the actual values given in the data.

First, we calculate the predicted values using the linear regression equation: y = 3.6729x + 168.1813, where x represents the year.

Predicted values:

Year 1: y = 3.6729(1) + 168.1813 ≈ 171.8542
Year 2: y = 3.6729(2) + 168.1813 ≈ 175.5271
Year 3: y = 3.6729(3) + 168.1813 ≈ 179.2000
Year 4: y = 3.6729(4) + 168.1813 ≈ 182.8729
Year 5: y = 3.6729(5) + 168.1813 ≈ 186.5458

Next, we calculate the absolute percent error for each year, which is the absolute difference between the predicted and actual values divided by the actual value, multiplied by 100:

Absolute Percent Error (APE):

Year 1: |(140 - 171.8542) / 140| * 100 ≈ 18.467
Year 2: |(160 - 175.5271) / 160| * 100 ≈ 9.704
Year 3: |(190 - 179.2000) / 190| * 100 ≈ 5.684
Year 4: |(200 - 182.8729) / 200| * 100 ≈ 8.563
Year 5: |(210 - 186.5458) / 210| * 100 ≈ 11.682
Finally, we calculate the average of the absolute percent errors:

MAPE = (APE₁ + APE₂ + APE₃ + APE₄ + APE₅) / n

MAPE ≈ (18.467 + 9.704 + 5.684 + 8.563 + 11.682) / 5 ≈ 10.42

The Mean Absolute Percent Error (MAPE) for the linear regression model is approximately 10.42%.

This value represents the average percentage difference between the predicted values and the actual values, providing a measure of the relative accuracy of the model.

Learn more about Equation click here :brainly.com/question/13763238

#SPJ11

Answer:

I also need help

Step-by-step explanation:

A ship is on its maiden voyage to the mystery island. According to the map, it has to travel

99 miles to the north and then, 20 miles to the west to reach the island. Find the shortest

route that leads to the mystery island.

Answer:

20 miles

Step-by-step explanation:

would you rather go 99 miles or 20 miles

Answer:

3 books on each shelf

5 books on each shelf

Step-by-step explanation:

Step-by-step explanation:

oh, come on. you can just use common sense.

a local minimum is a point where the curve goes down to, and then turns around and starts to go up again. that point in the middle, where it turns around and does not go down any further, is the minimum.

for the maximum the same thing applies, just in the other direction (the curve goes up and turns around to go back down again).

a)

the local minimum values (y) are

-2, -1

b)

the values of x where it had these minimum values are

-1, +3

Answer:

The angles

Step-by-step explanation:

On both triangles, there is a square in the corner which means that both angles are 90 degrees, and then on the left side of the triangle, there are two signs that are the sames meaning those two have the same angle measurement. Based on this knowledge I know that the last angle of the triangle must also be the same degrees since both triangles follow the same equation 90+a+b=180. I know that all angle measurements from one triangle must equal 180. So these are the same triangles with different sizes.

Hope this helps you

Answer:

what does this say?

Step-by-step explanation:

Answer: if you're just going to post stupld stuff then just don't ask it

Step-by-step explanation:

Answer:

i think its the third one i could be wrong

Step-by-step explanation:

I think its the last one

The reason that can be used to show that the lines are parallel is: alternate exterior angles converse.

The alternate exterior angles converse can be defined as rule that states that if two exterior angles that lie on each of the lines that is crossed by a transversal are congruent, then the lines can be said to be parallel lines.

The diagram below shows two lines that are intersected by a transversal. It also shows two pairs of alternate exterior angles, a and d, and b and c.

If angles a and d are congruent or angles b and c are congruent, then both lines can be proven to be parallel to each other by the alternate exterior angles converse.

Learn more about alternate exterior angles converse on:

https://brainly.com/question/10565830

#SPJ1

The correct response is 3. Havasupai Falls. We travelled from coast to coast, finding new places to visit and selecting the best landmark in each state. We decided on Havasupai Falls for Arizona.

Arizona's most well-known and current official moniker, "The Grand Canyon State," honours the state's most recognizable natural landmark, the Grand Canyon. Arizona is frequently referred to as the "Copper State," which indicates how abundant this mineral is there. More than 7.279 million people live in the stunning state of Arizona, which is situated in the southwest region of the country. Arizona is a great area to live and is frequently regarded as one of the best places in the nation to start a new life. It is known as The Grand Canyon State. Discover Arizona's snow in Flagstaff. Snow does fall in Flagstaff. plenty of snow! In its yearly assessment based on the state's Gross Domestic Product (GDP), population, and job growth, the American Legislative Exchange Council's most recent Rich States, Poor States research gave Arizona the highest ratings in the nation.

To know more about Arizona here

https://brainly.com/question/18485135

#SPJ4

Answer:   ( -8)+(6)= 14

                (-3)+8 = 11

                12+(-13) = 25

           -14-16= -30

        6+(41) =47

The equation of line is given by y = 3x - 1 and the slope is m = 3

The equation of a line is expressed as y = mx + b where m is the slope and b is the y-intercept

And y - y₁ = m ( x - x₁ )

y = y-coordinate of second point

y₁ = y-coordinate of point one

m = slope

x = x-coordinate of second point

x₁ = x-coordinate of point one

The slope m = ( y₂ - y₁ ) / ( x₂ - x₁ )

Given data ,

Let the equation of line be represented as A

Now , the value of A is

Substituting the values in the equation , we get

y = 3x - 1   be equation (1)

And , equation of a line is expressed as y = mx + b where m is the slope and b is the y-intercept

So , the slope of the line is m = 3

The y intercept of the line b = -1

Hence , the equation of line is y = 3x - 1 and the graph is plotted

To learn more about equation of line click :

https://brainly.com/question/14200719

#SPJ1

Answer:

2

Step-by-step explanation:

It would have to be the same as the hours but also modified by 0.5

A reasonable domain for the given situation f is 0≤t≤12.

Given that, a restaurant is open from 2 pm to 2 am on a certain day, and a maximum of 200 clients can fit inside.

Inequalities are the mathematical expressions in which both sides are not equal. In inequality, unlike in equations, we compare two values. The equal sign in between is replaced by less than (or less than or equal to), greater than (or greater than or equal to), or not equal to sign.

The input to f is the number of hours after 2 pm. The restaurant is open from 2 pm to 2 am, so a reasonable domain for f is 0≤t≤12.

Alternatively, it would be reasonable to assert that the domain is 0≤t<24 with the understanding that f(t)=0 for 12<t<24.

The output of f is the number of clients in the restaurant. The restaurant holds a maximum of 200 clients, so a reasonable range for f is any whole number from 0 to 200.

Therefore, a reasonable domain for the given situation f is 0≤t≤12.

To learn more about the inequalities visit:

https://brainly.com/question/20383699.

#SPJ2

Answer:

4979

Step-by-step explanation:

The required probability for the number of phone calls more than two in next 30 minutes is equal to ( 18 / 5)e⁻⁶.

Number of phone calls between 6pm and 8.00 pm 'n' = About 6 calls

Using Poisson's distribution we have,

P ( X = x ) = ( e⁻ⁿ nˣ ) / x!

Probability of receiving more than 2 phone calls in next 30 minutes

= P( X > 2 )

= P ( X = 3 ) + P ( X = 4 ) + P ( X = 5) + P( X = 6)

= ( e⁻⁶ 6³ ) / 3! +  ( e⁻⁶ 6⁴ ) / 4! +  ( e⁻⁶ 6⁵) / 5! +  ( e⁻⁶ 6⁶ ) / 6!

=  ( e⁻⁶ 6³ ) / 3! [ 1 +  (6 / 4) + (6² / 5× 4 ) + ( 6³ / 6 ×5× 4) ]

= ( e⁻⁶ 6³ ) / 3! [ ( 20 + 30 + 72 ) / 20 ]

= ( 18 / 5)e⁻⁶.

Therefore, the probability of more than two phone calls is  ( 18 / 5)e⁻⁶.

learn more about probability here

brainly.com/question/11234923

#SPJ4

Answer:

Step-by-step explanation:

Write an equation and solve: y decreased by 23 is 52.9

y - 23 = 52.9

y = 52.9 + 23

y = 75.9

------------------------

check

75.9 - 23 = 52.9

52.9 = 52.9

the answer is good

The speed of object is 3.68m\s.

Given that,

Mass of the object =  5.2 kg,

Object that possesses 26.1 J of kinetic energy.

We have to find,

The speed of the object.

According to the question,

Kinetic energy is a form of energy that an object or a particle has by reason of its motion.

If work, which transfers energy, is done on an object by applying a net force, the object speeds up and there by gains kinetic energy.

Then, The formula of kinetic energy is given as,

\(K.E = \frac{1}{2} mv^{2}\)

Where, m = mass of the object

And v = speed of the object

Therefore, The speed of the object calculated as.

\(KE = \frac{1}{2} mv^{2} \\\\26.1 = \frac{1}{2} \times 5.2\times v^{2} \\\\26.1 = 2.6 \times v^{2} \\\\\frac{26.1}{2.6} = v^{2} \\\\v^{2} = 10.1\\\\v = \sqrt{10.1} \\\\v = 3.68\)

Hence, The speed of object is 3.68m\s.

For more information about kinetic energy click the link given below.

https://brainly.com/question/20339401

Verify the divergence theorem for the given region W, boundary ∂W oriented outward, and vector field F. W = [0, 1] ✕ [0, 1] ✕ [0, 1] F = 2xi + 3yj + 2zk

The divergence theorem is correct and verified by using the formula S = ∫∫(F . n) dS = ∫∫∫(∇ . F) dV where,∇ . F is the divergence of the given vector field.

Divergence theorem: The divergence theorem states that the flux of a vector field through a closed surface is equal to the volume integral of the divergence over the region enclosed by the surface. Here, it is given to verify the divergence theorem for the given region W, boundary ∂W oriented outward, and vector field F, which is given as,W = [0, 1] x [0, 1] x [0, 1]F = 2xi + 3yj + 2zkHere, we need to find the flux of the given vector field through the boundary of the given region W using the divergence theorem. We know that the flux of a vector field F through the closed surface S is given by, Flux of F through S = ∫∫(F . n) dS Where n is the outward pointing unit normal to the surface S.In the divergence theorem, the flux of F through the closed surface S is given by, Flux of F through S = ∫∫(F . n) dS = ∫∫∫(∇ . F) dV where,∇ . F is the divergence of the given vector field F and V is the volume enclosed by the surface S.Now, let us find the divergence of the given vector field F, which is given by,F = 2xi + 3yj + 2zk

∇ . F = ∂(2x)/∂x + ∂(3y)/∂y + ∂(2z)/∂z= 2 + 3 + 2= 7

Therefore, the divergence of the given vector field F is 7.

Now, let us find the volume of the given region W using the triple integral, Volume of W = ∫∫∫dV= ∫[0,1]∫[0,1]∫[0,1]dxdydz= ∫[0,1]∫[0,1]1dx dy= ∫[0,1]dx= 1

Therefore, the volume of the given region W is 1. Now, using the divergence theorem, we can find the flux of the given vector field F through the boundary of the given region W, which is given by, Flux of F through the boundary of W = ∫∫(F . n) dS = ∫∫∫(∇ . F) dV= ∫∫∫ 7 dV= 7 * Volume of W= 7 * 1= 7. Therefore, the flux of the given vector field F through the boundary of the given region W is 7.

Hence verified.

Learn more about the Divergence theorem: https://brainly.com/question/17177764

#SPJ11

The area of the label on the canned tuna fish would be A = 25.13272 square inches

Given data ,

The whole side of the can, including the can's lateral surface area, is covered with the label for the canned tuna fish. The following formula may be used to determine a cylinder's lateral surface area:

Height x circumference = lateral surface area.

The radius (r) would be half of the can's diameter, or 2 inches, since its diameter is 4 inches.

The formula: may be used to determine a circle's circumference.

Circumference = 2πr

On simplifying , we get

Circumference = 2 × 3.14159 × 2 = 12.56636 inches

Lateral surface area = height × circumference = 2 × 12.56636 = 25.13272 square inches

Hence , the lateral surface area of the label is A = 25.132 inches²

To learn more about circle click :

https://brainly.com/question/28391204

#SPJ1

The complete question is attached below :

A can of tuna fish has a diameter of 4 inches and a height of 2 inches what is the area of the label of the canned assuming that covers the entire side if they can

Answer:

8z+5

Step-by-step explanation:

Let's split the expression into two terms- z and... not z :)

3z+5z=8z

Why? it's just 3+5 with z tacked on the end

14-9=5

simple math :)

put it together to get

8z+5

all done!

lmk if you have any more questions

Step-by-step explanation:

x1y1 x2y2

(1,-2)(4,7)

y2-y1

x2-x1

7-(-2) = 9 = 3

4-1 3 1

To approximate the surface area of one slipcover for Davea's topiaries, we need more information regarding the shape and dimensions of the topiaries.

To calculate the surface area of a slipcover, we need information about the shape and dimensions of the topiary. Depending on the specific shape, whether it is a cone, cylinder, or other geometric form, the surface area formula will differ. For example, if the topiary is a cone, the surface area formula would involve the radius and slant height of the cone. If it is a cylinder, the surface area formula would involve the radius and height of the cylinder. Without these details, it is impossible to provide an accurate estimate of the surface area of the slipcover. However, in general, the slipcover would cover the entire surface of the topiary, excluding the base, to provide adequate protection against frost.

To learn more about surface area click here: brainly.com/question/29298005

#SPJ11

Below, you will learn how to solve the problem.

(a) To find the linear relationship y = mx + b between x = year and y = profit, we first need to find the slope (m) and the y-intercept (b).

The slope (m) is the change in y (profit) divided by the change in x (year):
m = (17 - 5)/(6 - 2)

m = 12/4

m = 3

Next, we can use one of the data points (2, 5) and the slope (3) to find the y-intercept (b):
5 = 3(2) + b
b = 5 - 6

b = -1

So the linear relationship between x = year and y = profit is:

y = 3x - 1

(b) To find the company's profit at the end of 3 years, we can plug in x = 3 into the equation:
y = 3(3) - 1

y = 8

So the company's profit at the end of 3 years is $8 million.

(c) To predict the company's profit at the end of 8 years, we can plug in x = 8 into the equation:

y = 3(8) - 1 = 23

So the company's profit at the end of 8 years is predicted to be $23 million.

For more information about equation, visit:

https://brainly.com/question/22688504

#SPJ11

Answer:multiplication between probability density values (Y-axis) and tips amount (X-axis)

Step-by-step explanation:

In general, the better histogram for analyzing data is the one that is easier to understand and interpret. This typically means that the histogram should have clear and evenly spaced intervals, a clearly labeled x-axis and y-axis, and an appropriate scale.

Additionally, the histogram should accurately represent the data and not be misleading in any way. If one of the histograms provided meets these criteria better than the other, then that histogram would be better for analyzing the data.

The number of modes in an IA histogram might be used to give it a name.

The histogram shown has a (c) bimodal form.

Thus, the histogram must be bimodal (i.e. two modes)

Using the number of modes to identify the histogram, we may say that its form is (c) bimodal.

Learn more about histograms:

https://brainly.com/question/25983327

#SPJ11

For Question 6, P(X<2) is approximately 0.397. For Question 7, P(X>3) is approximately 0.011. For Question 8, the standard deviation of X is approximately 8.1.



Question 6: The random variable X represents the number of individuals with the particular trait in a sample of 5 U.S. Adults, where the prevalence rate is 36.7%. To find P(X<2), we need to calculate the probability of having 0 or 1 individuals with the trait in the sample. We can use the binomial probability formula to compute this probability. P(X<2) = P(X=0) + P(X=1) = (5 choose 0) * (0.367)^0 * (1 - 0.367)^(5-0) + (5 choose 1) * (0.367)^1 * (1 - 0.367)^(5-1). Simplifying this expression gives P(X<2) ≈ 0.397.

Question 7: The random variable X represents the number of individuals with the particular trait in a sample of 5 U.S. Adults, where the prevalence rate is 25.2%. To find P(X>3), we need to calculate the probability of having 4 or 5 individuals with the trait in the sample. Again, we can use the binomial probability formula. P(X>3) = P(X=4) + P(X=5) = (5 choose 4) * (0.252)^4 * (1 - 0.252)^(5-4) + (5 choose 5) * (0.252)^5 * (1 - 0.252)^(5-5). Simplifying this expression gives P(X>3) ≈ 0.011.

Question 8: The random variable X represents the number of individuals with the particular trait in a sample of 325 U.S. Adults, where the prevalence rate is 71.7%. To find the standard deviation of X, we can use the formula for the standard deviation of a binomial distribution: σ = sqrt(n * p * (1 - p)), where n is the sample size and p is the prevalence rate. Plugging in the values, we get σ = sqrt(325 * 0.717 * (1 - 0.717)) ≈ 8.1. Therefore, the standard deviation of X is approximately 8.1.

Therefore, For Question 6, P(X<2) is approximately 0.397. For Question 7, P(X>3) is approximately 0.011. For Question 8, the standard deviation of X is approximately 8.1.

To learn more about standard deviation click here

brainly.com/question/13498201

#SPJ11

Answer:

D. Cl₂

Step-by-step explanation:

Answer: B

Step-by-step explanation: