Question 1

In interval estimation, as the sample size becomes larger, the interval estimate

Accepted Answer

A) ​becomes narrower. 
B) ​becomes wider. 
C) remains the same, since the mean is not changing. 
D) gets closer to 1.96. 
A) ​becomes narrower. 
B) ​becomes wider. 
C) remains the same, since the mean is not changing. 
D) gets closer to 1.96.

Question 2

In a random sample of 400 registered voters, 120 indicated they plan to vote for Trump for President. Determine a 95% confidence interval for the proportion of all the registered voters who will vote for Trump. ​

Accepted Answer

A) (0.25, 0.34) 
B) (0.27, 0.32) 
C) (0.29, 0.30) 
D) Cannot be determined from the information given. 
A) (0.25, 0.34) 
B) (0.27, 0.32) 
C) (0.29, 0.30) 
D) Cannot be determined from the information given.

Question 3

The CEO of a company wants to estimate the percent of employees that use company computers to go on Facebook during work hours with 95% confidence. He selects a random sample of 150 of the employees and finds that 53 of them logged onto Facebook that day. What is the point estimate of the proportion of the population that logged onto Facebook that day?

Accepted Answer

A) 0.25 
B) 0.35 
C) 0.53 
D) 0.65 
A) 0.25 
B) 0.35 
C) 0.53 
D) 0.65

Question 4

A statistics teacher started class one day by drawing the names of 10 students out of a hat and asked them to do as many pushups as they could. The 10 randomly selected students averaged 15 pushups per person with a standard deviation of 9 pushups.Suppose the distribution of the population of number of pushups that can be done is approximately normal. The 95% confidence interval for the true mean number of pushups that can be done is ​

Accepted Answer

A) ​5.75 to 24.25. 
B) ​8.56 to 21.40. 
C) 11.31 to 18.55. 
D) ​13.02 to 16.98. 
A) ​5.75 to 24.25. 
B) ​8.56 to 21.40. 
C) 11.31 to 18.55. 
D) ​13.02 to 16.98.

Question 5

A pizza shop advertises that they deliver in 30 minutes or less or it is free. People who live in homes that are located on the opposite side of town believe it will take the pizza shop longer than 30 minutes to make and deliver the pizza. Write the null and alternative hypotheses that can be used to conduct a significance test.

Accepted Answer

A) H0: m ≤ 30, Ha: m > 30 B) H0: m a: m > 30 C) H0: m ≥ 30, Ha: m 0: m > 30, Ha: m < 30 A) H0: m ≤ 30, Ha: m > 30 B) H0: m a: m > 30 C) H0: m ≥ 30, Ha: m 0: m > 30, Ha: m < 30

Question 6

A pizza shop advertises that they deliver in 30 minutes or less or it is free. People who live in homes that are located on the opposite side of town believe it will take the pizza shop longer than 30 minutes to make and deliver the pizza. A random sample of 50 deliveries to homes across town was taken and the mean time was computed to be 32 minutes. What is the appropriate symbol to represent the value, 32?

Accepted Answer

A) ?u = 32 
B)  $\bar { x } = 32$ 
C) ?n =32 
D)  $\bar { p } = 32$ 
A) ?u = 32 
B)  $\bar { x } = 32$ 
C) ?n =32 
D)  $\bar { p } = 32$

Question 7

The CEO of a company wants to estimate the percent of employees that use company computers to go on Facebook during work hours with 95% confidence.He selects a random sample of 150 of the employees and finds that 53 of them logged onto Facebook that day.Compute the 95% confidence interval for the population proportion.

Accepted Answer

A) ? $0.35 \pm 1.96 \sqrt { \frac { 0.35 ( 1 - 0.35 ) } { 150 } }$ 
B) ? $0.35 \pm 1.645 \sqrt { \frac { 0.35 ( 1 - 0.35 ) } { 150 } }$ 
C) ? $0.53 \pm 1.645 \sqrt { \frac { 0.53 ( 1 - 0.53 ) } { 150 } }$ 
D) ? $0.53 \pm 1.96 \sqrt { \frac { 0.53 ( 1 - 0.53 ) } { 150 } }$ 
A) ? $0.35 \pm 1.96 \sqrt { \frac { 0.35 ( 1 - 0.35 ) } { 150 } }$ 
B) ? $0.35 \pm 1.645 \sqrt { \frac { 0.35 ( 1 - 0.35 ) } { 150 } }$ 
C) ? $0.53 \pm 1.645 \sqrt { \frac { 0.53 ( 1 - 0.53 ) } { 150 } }$ 
D) ? $0.53 \pm 1.96 \sqrt { \frac { 0.53 ( 1 - 0.53 ) } { 150 } }$

Question 8

The purpose of statistical inference is to make estimates or draw conclusions about a

Accepted Answer

A) ​sample based upon information obtained from the population. 
B) ​population based upon information obtained from the sample. 
C) statistic based upon information obtained from the population. 
D) mean of the sample based upon the mean of the population. 
A) ​sample based upon information obtained from the population. 
B) ​population based upon information obtained from the sample. 
C) statistic based upon information obtained from the population. 
D) mean of the sample based upon the mean of the population.

Question 9

Larger values of have the disadvantage of increasing the probability of making a ​

Accepted Answer

A) ​Type I error. 
B) Type II error​. 
C) ​random sampling error. 
D) ​normal probability error. 
A) ​Type I error. 
B) Type II error​. 
C) ​random sampling error. 
D) ​normal probability error.

Question 10

A parameter is a numerical measure from a population, such as ?

Accepted Answer

A) ?u. 
B)  $\bar { x }$ ?. 
C) ?s. 
D) ? $\bar { p }$ . 
A) ?u. 
B)  $\bar { x }$ ?. 
C) ?s. 
D) ? $\bar { p }$ .

Question 11

In order to determine an interval for the mean of a population with unknown standard deviation a sample of 24 items is selected. The mean of the sample is determined to be 23. The number of degrees of freedom for reading the t value is

Accepted Answer

A) 21. 
B) 22. 
C) 23. 
D) 24. 
A) 21. 
B) 22. 
C) 23. 
D) 24.

Question 12

A null and alternative hypothesis for a one proportion z test are given as H0: p = 0.8, Ha: p < 0.8. This hypothesis test is

Accepted Answer

A) lower-tailed. 
B) upper-tailed. 
C) two-tailed. 
D) these hypotheses are incorrectly stated. 
A) lower-tailed. 
B) upper-tailed. 
C) two-tailed. 
D) these hypotheses are incorrectly stated.

Question 13

A simple random sample of 100 observations was taken from a large population. The sample mean and the standard deviation were determined to be 80 and 12 respectively. Calculate the standard error of the mean.
​

Accepted Answer

The answer of A simple random sample of 100 observations...

Question 14

A cellular phone company claims that the mean amount spent per month is more than $75. A test is made of Ho: μ = 75 versus Ha: μ > 75. The null hypothesis is rejected. State the appropriate conclusion.
​

Accepted Answer

There is sufficient evidence t

Question 15

As the number of degrees of freedom for a t distribution increases, the difference between the t distribution and the standard normal distribution

Accepted Answer

A) becomes larger. 
B) becomes smaller. 
C) stays the same. 
D) fluctuates. 
A) becomes larger. 
B) becomes smaller. 
C) stays the same. 
D) fluctuates.

Question 16

What are the two decisions that you can make from performing a hypothesis​ test? ​​

Accepted Answer

A) Reject the null hypothesis; Fail to reject the null hypothesis 
B) Accept the null hypothesis; Accept the alternative hypothesis 
C) Make a type I error; Make a type II error 
D) Reject the alternative hypothesis; Accept the null hypothesis 
A) Reject the null hypothesis; Fail to reject the null hypothesis 
B) Accept the null hypothesis; Accept the alternative hypothesis 
C) Make a type I error; Make a type II error 
D) Reject the alternative hypothesis; Accept the null hypothesis

Question 17

Numerical characteristics of the population are called
​

Accepted Answer

The answer of Numerical characteristics of the population are called
​...

Question 18

The random numbers generated using Excels RAND function follows a ________________ probability distribution between 0 and 1. ​

Accepted Answer

A) ​normal 
B) ​uniform 
C) binomial 
D) ​random 
A) ​normal 
B) ​uniform 
C) binomial 
D) ​random

Question 19

A large manufacturing plant has analyzed the amount of time required to produce an electrical part and determined that the times follow a normal distribution with mean time ? = 45 hours. The production manager has developed a new procedure for producing the part. He believes that the new procedure will decrease the population mean amount of time required to produce the part. After training a group of production line workers, a random sample of 25 parts will be selected and the average amount of time required to produce them will be determined. If the switch is made to the new procedure, the cost to implement the new procedure will be more than offset by the savings in manpower required to produce the parts. Use the hypotheses: Ho: ? ? .45 hours and Ha: ? < 45 hours. If the sample mean amount of time is $\bar { x }$ = 43.118 hours with the sample standard deviation s = 5.5 hours, give the appropriate conclusion, for ? = 0.025. ?

Accepted Answer

A) Do not reject Ho, do not switch to the new procedure. 
B) Reject Ho, switch to the new procedure. 
C) Reject Ho, do not switch to the new procedure. 
D) Do not reject Ho, switch to the new procedure. 
A) Do not reject Ho, do not switch to the new procedure. 
B) Reject Ho, switch to the new procedure. 
C) Reject Ho, do not switch to the new procedure. 
D) Do not reject Ho, switch to the new procedure.

Question 20

The population parameter value and the point estimate differ because a sample is not a census of the entire population, but it is being used to develop the ​   ​

Accepted Answer

A) population parameter. 
B) point estimate. 
C) population mean. 
D) standard error. 
A) population parameter. 
B) point estimate. 
C) population mean. 
D) standard error.

In interval estimation, as the sample size becomes larger, the interval estimate

In a random sample of 400 registered voters, 120 indicated they plan to vote for Trump for President. Determine a 95% confidence interval for the proportion of all the registered voters who will vote for Trump.

The purpose of statistical inference is to make estimates or draw conclusions about a

Larger values of have the disadvantage of increasing the probability of making a

A parameter is a numerical measure from a population, such as ?

In order to determine an interval for the mean of a population with unknown standard deviation a sample of 24 items is selected. The mean of the sample is determined to be 23. The number of degrees of freedom for reading the t value is

A null and alternative hypothesis for a one proportion z test are given as H₀: p = 0.8, H_a: p < 0.8. This hypothesis test is

A simple random sample of 100 observations was taken from a large population. The sample mean and the standard deviation were determined to be 80 and 12 respectively. Calculate the standard error of the mean.

A cellular phone company claims that the mean amount spent per month is more than $75. A test is made of H_o: μ = 75 versus H_a: μ > 75. The null hypothesis is rejected. State the appropriate conclusion.

As the number of degrees of freedom for a t distribution increases, the difference between the t distribution and the standard normal distribution

What are the two decisions that you can make from performing a hypothesis test?

Numerical characteristics of the population are called

The random numbers generated using Excels RAND function follows a ________________ probability distribution between 0 and 1.

The population parameter value and the point estimate differ because a sample is not a census of the entire population, but it is being used to develop the

Introduction

Descriptive Statistics

Data Visualization

Descriptive Data Mining

Probability: an Introduction to Modeling Uncertainty

Linear Regression

Time Series Analysis and Forecasting

Predictive Data Mining

Spreadsheet Models

Linear Optimization Models

Integer Linear Optimization Models

Nonlinear Optimization Models

Monte Carlo Simulation

Decision Analysis

Filters

Exam 6: Statistical Inference

In interval estimation, as the sample size becomes larger, the interval estimate

In a random sample of 400 registered voters, 120 indicated they plan to vote for Trump for President. Determine a 95% confidence interval for the proportion of all the registered voters who will vote for Trump. ​

The purpose of statistical inference is to make estimates or draw conclusions about a

Larger values of have the disadvantage of increasing the probability of making a ​

A parameter is a numerical measure from a population, such as ?

In order to determine an interval for the mean of a population with unknown standard deviation a sample of 24 items is selected. The mean of the sample is determined to be 23. The number of degrees of freedom for reading the t value is

A null and alternative hypothesis for a one proportion z test are given as H0: p = 0.8, Ha: p < 0.8. This hypothesis test is

A simple random sample of 100 observations was taken from a large population. The sample mean and the standard deviation were determined to be 80 and 12 respectively. Calculate the standard error of the mean. ​

A cellular phone company claims that the mean amount spent per month is more than $75. A test is made of Ho: μ = 75 versus Ha: μ > 75. The null hypothesis is rejected. State the appropriate conclusion. ​

As the number of degrees of freedom for a t distribution increases, the difference between the t distribution and the standard normal distribution

What are the two decisions that you can make from performing a hypothesis​ test? ​​

Numerical characteristics of the population are called ​

The random numbers generated using Excels RAND function follows a ________________ probability distribution between 0 and 1. ​

The population parameter value and the point estimate differ because a sample is not a census of the entire population, but it is being used to develop the ​ ​

Introduction

Descriptive Statistics

Data Visualization

Descriptive Data Mining

Probability: an Introduction to Modeling Uncertainty

Linear Regression

Time Series Analysis and Forecasting

Predictive Data Mining

Spreadsheet Models

Linear Optimization Models

Integer Linear Optimization Models

Nonlinear Optimization Models

Monte Carlo Simulation

Decision Analysis

Filters

In a random sample of 400 registered voters, 120 indicated they plan to vote for Trump for President. Determine a 95% confidence interval for the proportion of all the registered voters who will vote for Trump.

Larger values of have the disadvantage of increasing the probability of making a

A null and alternative hypothesis for a one proportion z test are given as H₀: p = 0.8, H_a: p < 0.8. This hypothesis test is

A simple random sample of 100 observations was taken from a large population. The sample mean and the standard deviation were determined to be 80 and 12 respectively. Calculate the standard error of the mean.

A cellular phone company claims that the mean amount spent per month is more than $75. A test is made of H_o: μ = 75 versus H_a: μ > 75. The null hypothesis is rejected. State the appropriate conclusion.

What are the two decisions that you can make from performing a hypothesis test?

Numerical characteristics of the population are called

The random numbers generated using Excels RAND function follows a ________________ probability distribution between 0 and 1.

The population parameter value and the point estimate differ because a sample is not a census of the entire population, but it is being used to develop the