rialsv
2022-09-08
Answered

Assume normal distributions in the following exercises. Find the value of z. An estimated 15%of the scores are to the right of z.

You can still ask an expert for help

Jordyn Valdez

Answered 2022-09-09
Author has **8** answers

The z-score represents the number of standard deviations between an observation and the mean. Whatever scale is used for æ on a normal curve, we can associate a value of z with each value of a.

We use z to find the area under the normal curve between two scores. To do so,we use the standard normal table. The table gives area between the mean and aZ-score for selected z-scores. So as 15% of the result is to the right of 2, and the normal distribution is symmetric with the area below the normal curve 1, is 0.5 on the left and right sides of the mean. This actually means that between z and the mean is 35%, so the area between z and the mean is 0.35. Using the table of standard normal distribution we can see that the area A = 0.35 corresponds to z = 1.04.

We use z to find the area under the normal curve between two scores. To do so,we use the standard normal table. The table gives area between the mean and aZ-score for selected z-scores. So as 15% of the result is to the right of 2, and the normal distribution is symmetric with the area below the normal curve 1, is 0.5 on the left and right sides of the mean. This actually means that between z and the mean is 35%, so the area between z and the mean is 0.35. Using the table of standard normal distribution we can see that the area A = 0.35 corresponds to z = 1.04.

asked 2021-02-27

The manager of the store in the preceding exercise calculated the residual for each point in the scatterplot and made a dotplot of the residuals.

The distribution of residuals is roughly Normal with a mean of $0 and standard deviation of $22.92.

The middle 95% of residuals should be between which two values? Use this information to give an interval of plausible values for the weekly sales revenue if 5 linear feet are allocated to the stores

The distribution of residuals is roughly Normal with a mean of $0 and standard deviation of $22.92.

The middle 95% of residuals should be between which two values? Use this information to give an interval of plausible values for the weekly sales revenue if 5 linear feet are allocated to the stores

asked 2021-05-03

Describe in words the surface whose equation is given. (assume that r is not negative.) $\theta =\frac{\pi}{4}$

a) The plane$y=-z$ where y is not negative

b) The plane$y=z$ where y and z are not negative

c) The plane$y=x$ where x and y are not negative

d) The plane$y=-x$ where y is not negative

e) The plane$x=z$ where x and y are not negative

a) The plane

b) The plane

c) The plane

d) The plane

e) The plane

asked 2021-02-25

Explain why t distributions tend to be flatter and more spread out than the normal distribution.

asked 2021-02-25

Basic Computation:$\hat{p}$ Distribution Suppose we have a binomial experiment in which success is defined to be a particular quality or attribute that interests us.

(b) Suppose$n=25$ and $p=0.15$ . Can we safely approximate the $\hat{p}$ distribution by a normal distribution? Why or why not?

(b) Suppose

asked 2021-12-01

Which of the following are characteristics of the Normal Distribution?

i. bell shaped

ii. continuous

iii. discrete

iv. symmetric

i. bell shaped

ii. continuous

iii. discrete

iv. symmetric

asked 2021-08-15

. a. 0.97

b. -0.97

c. 0.64

d. -0.64

asked 2021-01-19

Identify the null and alternative hypothesis in the following scenario.

To determine if battery 1 lasts longer than battery 2, the mean lasting times, of the two competing batteries are compared. Twenty batteries of each type are randomly sampled and tested. Both populations have normal distributions with unknown standard deviations.

Select the correct answer below: