Question 1

Which Excel function would not be appropriate to use when conducting a hypothesis test for a population proportion?

Accepted Answer

A) NORM.S.DIST 
B) COUNTIF 
C) STDEV 
D) All are appropriate. 
A) NORM.S.DIST 
B) COUNTIF 
C) STDEV 
D) All are appropriate.

Question 2

Read the z statistic from the normal distribution table and circle the correct answer. A one-tailed test (lower tail) at a .063 level of significance; z =

Accepted Answer

A) -1.86 
B) -1.53 
C) -1.96 
D) -1.645 
A) -1.86 
B) -1.53 
C) -1.96 
D) -1.645

Question 3

You are given the following information obtained from a random sample of 5 observations.   At a 10% level of significance, use Excel to determine whether or not the mean of the population from which this sample was taken is significantly less than 21. (Assume the population is normally distributed.)

Accepted Answer

@#IMG-DLM& Reject H₀, .04450

Question 4

A meteorologist stated that the average temperature during July in Chattanooga was 80 degrees. A sample of 32 Julys was taken. The correct set of hypotheses is

Accepted Answer

A) H0: $\mu$ a: $\mu$ $\le$ 80 
B) H0: $\mu$ $\le$ 80 Ha: $\mu$ > 80 
C) H0: $\mu$ $\neq$ 80 Ha: $\mu$ = 80 
D) None of the other answers are correct. 
A) H0: $\mu$ a: $\mu$ $\le$ 80 
B) H0: $\mu$ $\le$ 80 Ha: $\mu$ > 80 
C) H0: $\mu$ $\neq$ 80 Ha: $\mu$ = 80 
D) None of the other answers are correct.

Question 5

Exhibit 9-3  
-Refer to Exhibit 9-3. The p-value is equal to

Accepted Answer

A) 0.1151 
B) 0.3849 
C) 0.2698 
D) 0.2302 
A) 0.1151 
B) 0.3849 
C) 0.2698 
D) 0.2302

Question 6

Read the z statistic from the normal distribution table and circle the correct answer. A one-tailed test (upper tail) at a .123 level of significance; z =

Accepted Answer

A) 1.54 
B) 1.96 
C) 1.645 
D) 1.16 
A) 1.54 
B) 1.96 
C) 1.645 
D) 1.16

Question 7

Exhibit 9-1  
-Refer to Exhibit 9-1. If the test is done at a .05 level of significance, the null hypothesis should

Accepted Answer

A) not be rejected 
B) be rejected 
C) Not enough information is given to answer this question. 
D) None of the other answers are correct. 
A) not be rejected 
B) be rejected 
C) Not enough information is given to answer this question. 
D) None of the other answers are correct.

Question 8

The academic planner of a university thinks that at least 35% of the entire student body attends summer school. The correct set of hypotheses to test his belief is

Accepted Answer

A) H0: p > 0.35 Ha: p $\ge$ 0.35 
B) H0: p $\le$ 0.35 Ha: p > 0.35 
C) H0: p $\ge$ 0.35 Ha: p 0: p > 0.35 Ha: p $\le$ 0.35 
A) H0: p > 0.35 Ha: p $\ge$ 0.35 
B) H0: p $\le$ 0.35 Ha: p > 0.35 
C) H0: p $\ge$ 0.35 Ha: p 0: p > 0.35 Ha: p $\le$ 0.35

Question 9

A manufacturer claims that at least 40% of its customers use coupons. A study of 25 customers is undertaken to test that claim. The results of the study follow.   At a .05 level of significance, use Excel to test the manufacturer's claim.

Accepted Answer

@#IMG-DLM& Do not reject H₀,

Question 10

For a two-tailed hypothesis test about $\mu$, we can use any of the following approaches except

Accepted Answer

A) compare the confidence interval estimate of $\mu$ to the hypothesized value of $\mu$ 
B) compare the p-value to the value of $\alpha$ 
C) compare the value of the test statistic to the critical value 
D) compare the level of significance to the confidence coefficient 
A) compare the confidence interval estimate of $\mu$ to the hypothesized value of $\mu$ 
B) compare the p-value to the value of $\alpha$ 
C) compare the value of the test statistic to the critical value 
D) compare the level of significance to the confidence coefficient

Question 11

Exhibit 9-3  
-Refer to Exhibit 9-3. If the test is done at a 5% level of significance, the null hypothesis should

Accepted Answer

A) not be rejected 
B) be rejected 
C) Not enough information given to answer this question. 
D) None of the other answers are correct. 
A) not be rejected 
B) be rejected 
C) Not enough information given to answer this question. 
D) None of the other answers are correct.

Question 12

Exhibit 9-6
A random sample of 100 people was taken. Eighty of the people in the sample favored Candidate A. We are interested in determining whether or not the proportion of the population in favor of Candidate A is significantly more than 75%.
-The rejection region for a one-tailed hypothesis test

Accepted Answer

A) has an area of 1 - $\alpha$ 
B) has an area equal to the confidence coefficient 
C) is in the tail that supports the null hypothesis 
D) is in the tail that supports the alternative hypothesis 
A) has an area of 1 - $\alpha$ 
B) has an area equal to the confidence coefficient 
C) is in the tail that supports the null hypothesis 
D) is in the tail that supports the alternative hypothesis

Question 13

The board of directors of a corporation has agreed to allow the human resources manager to move to the next step in planning day care service for employees' children if the manager can prove that at least 25% of the employees have interest in using the service. The HR manager polls 300 employees and 90 say they would seriously consider utilizing the service. At the $\alpha$ = .10 level of significance, is there enough interest in the service to move to the next planning step?

Accepted Answer

p-value = .0228 < .10, so reje

Question 14

Excel's __________ function can be used to calculate a p-value for a hypothesis test.

Accepted Answer

A) RAND 
B) NORM.S.DIST 
C) NORM.S.INV 
D) Not enough information is given to answer this question. 
A) RAND 
B) NORM.S.DIST 
C) NORM.S.INV 
D) Not enough information is given to answer this question.

Question 15

When using Excel to calculate a p-value for a lower-tail hypothesis test, the following must be used

Accepted Answer

A) RAND 
B) 1 - NORM.S.DIST 
C) NORM.S.DIST 
D) Not enough information is given to answer this question. 
A) RAND 
B) 1 - NORM.S.DIST 
C) NORM.S.DIST 
D) Not enough information is given to answer this question.

Question 16

An example of statistical inference is

Accepted Answer

A) a population mean 
B) descriptive statistics 
C) calculating the size of a sample 
D) hypothesis testing 
A) a population mean 
B) descriptive statistics 
C) calculating the size of a sample 
D) hypothesis testing

Question 17

The sponsors of televisions shows targeted at the market of 5 - 8 year olds want to test the hypothesis that children watch television at most 20 hours per week. The population of viewing hours per week is known to be normally distributed with a standard deviation of 6 hours. A market research firm conducted a random sample of 30 children in this age group. The resulting data follows:   At a .10 level of significance, use Excel to test the sponsors' hypothesis.

Accepted Answer

@#IMG-DLM& Do not reject H₀, 0.403835 > .

Question 18

Exhibit 9-6
A random sample of 100 people was taken. Eighty of the people in the sample favored Candidate A. We are interested in determining whether or not the proportion of the population in favor of Candidate A is significantly more than 75%.
-If a hypothesis test has a Type I error probability of .05, that means

Accepted Answer

A) if the null hypothesis is false, it will not be rejected 5% of the time 
B) if the null hypothesis is false, it will be rejected 5% of the time 
C) if the null hypothesis is true, it will not be rejected 5% of the time 
D) if the null hypothesis is true, it will be rejected 5% of the time 
A) if the null hypothesis is false, it will not be rejected 5% of the time 
B) if the null hypothesis is false, it will be rejected 5% of the time 
C) if the null hypothesis is true, it will not be rejected 5% of the time 
D) if the null hypothesis is true, it will be rejected 5% of the time

Question 19

A student believes that the average grade on the statistics final examination is 87. A sample of 36 final examinations is taken. The average grade in the sample is 83.96. The population variance is 144.
a.State the null and alternative hypotheses.
b.Using a critical value, test the hypothesis at the 5% level of significance.
c.Using a p-value, test the hypothesis at the 5% level of significance.
d.Using a confidence interval, test the hypothesis at the 5% level of significance.
e.Compute the probability of a Type II error if the average grade on the final is 85.

Accepted Answer

a.H₀: @#LAT-DLM& = 87 H_a: @#LAT-DLM& @#LAT-DLM&

Question 20

At a certain manufacturing plant, a machine produces ball bearings that should have a diameter of 0.500 mm. If the machine produces ball bearings that are either too small or too large, the ball bearings must be scrapped. Every hour, a quality control manager takes a random sample of 36 ball bearings to test to see if the process is "out of control" (i.e. to test to see if the average diameter differs from 0.500 mm). Assume that the process is maintaining the desired standard deviation of .06 mm. The results from the latest sample follow:   
At a .01 level of significance, use Excel to test whether the process is "out of control."

Accepted Answer

@#IMG-DLM& Reject H₀, 0.0000

Which Excel function would not be appropriate to use when conducting a hypothesis test for a population proportion?

Read the z statistic from the normal distribution table and circle the correct answer. A one-tailed test (lower tail) at a .063 level of significance; z =

You are given the following information obtained from a random sample of 5 observations. At a 10% level of significance, use Excel to determine whether or not the mean of the population from which this sample was taken is significantly less than 21. (Assume the population is normally distributed.)

A meteorologist stated that the average temperature during July in Chattanooga was 80 degrees. A sample of 32 Julys was taken. The correct set of hypotheses is

Exhibit 9-3 -Refer to Exhibit 9-3. The p-value is equal to

Read the z statistic from the normal distribution table and circle the correct answer. A one-tailed test (upper tail) at a .123 level of significance; z =

Exhibit 9-1 -Refer to Exhibit 9-1. If the test is done at a .05 level of significance, the null hypothesis should

The academic planner of a university thinks that at least 35% of the entire student body attends summer school. The correct set of hypotheses to test his belief is

A manufacturer claims that at least 40% of its customers use coupons. A study of 25 customers is undertaken to test that claim. The results of the study follow. At a .05 level of significance, use Excel to test the manufacturer's claim.

For a two-tailed hypothesis test about $\mu$ , we can use any of the following approaches except

Exhibit 9-3 -Refer to Exhibit 9-3. If the test is done at a 5% level of significance, the null hypothesis should

Exhibit 9-6 A random sample of 100 people was taken. Eighty of the people in the sample favored Candidate A. We are interested in determining whether or not the proportion of the population in favor of Candidate A is significantly more than 75%. -The rejection region for a one-tailed hypothesis test

Excel's __________ function can be used to calculate a p-value for a hypothesis test.

When using Excel to calculate a p-value for a lower-tail hypothesis test, the following must be used

An example of statistical inference is

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit, Independence and Multiple Proportions

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters

Exam 9: Hypothesis Tests

Which Excel function would not be appropriate to use when conducting a hypothesis test for a population proportion?

Read the z statistic from the normal distribution table and circle the correct answer. A one-tailed test (lower tail) at a .063 level of significance; z =

You are given the following information obtained from a random sample of 5 observations. At a 10% level of significance, use Excel to determine whether or not the mean of the population from which this sample was taken is significantly less than 21. (Assume the population is normally distributed.)

A meteorologist stated that the average temperature during July in Chattanooga was 80 degrees. A sample of 32 Julys was taken. The correct set of hypotheses is

Exhibit 9-3 -Refer to Exhibit 9-3. The p-value is equal to

Read the z statistic from the normal distribution table and circle the correct answer. A one-tailed test (upper tail) at a .123 level of significance; z =

Exhibit 9-1 -Refer to Exhibit 9-1. If the test is done at a .05 level of significance, the null hypothesis should

The academic planner of a university thinks that at least 35% of the entire student body attends summer school. The correct set of hypotheses to test his belief is

A manufacturer claims that at least 40% of its customers use coupons. A study of 25 customers is undertaken to test that claim. The results of the study follow. At a .05 level of significance, use Excel to test the manufacturer's claim.

For a two-tailed hypothesis test about μ\muμ , we can use any of the following approaches except

Exhibit 9-3 -Refer to Exhibit 9-3. If the test is done at a 5% level of significance, the null hypothesis should

Excel's __________ function can be used to calculate a p-value for a hypothesis test.

When using Excel to calculate a p-value for a lower-tail hypothesis test, the following must be used

An example of statistical inference is

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit, Independence and Multiple Proportions

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters

For a two-tailed hypothesis test about $\mu$ , we can use any of the following approaches except