Question 1

If we want to perform a one-tail test for differences between two populations of nominal data with exactly two categories,we must employ the z-test of p1 − p2.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following tests is appropriate for nominal data if the problem objective is to compare two or more populations and the number of categories is at least 2?

Accepted Answer

A) The z-test for one proportion,p,or difference of two proportions,p1 − p2. 
B) The chi-squared goodness-of-fitness test. 
C) The chi-squared test of a contingency table. 
D) All of these choices are true. 
A) The z-test for one proportion,p,or difference of two proportions,p1 − p2. 
B) The chi-squared goodness-of-fitness test. 
C) The chi-squared test of a contingency table. 
D) All of these choices are true.

Question 3

The number of degrees of freedom for a contingency table with r rows and c columns is:

Accepted Answer

A) r + c 
B) rc 
C) (r − 1)(c − 1) 
D) None of these choices. 
A) r + c 
B) rc 
C) (r − 1)(c − 1) 
D) None of these choices.

Question 4

Sales Volumes 
A telemarketer makes five calls per day.A sample of 200 days gives the frequencies of sales volumes listed below:   Assume the population is binomial distribution with a probability of purchase p equal to .50.
-{Sales Volumes Narrative} Should the assumption of a binomial distribution be rejected at the 5% significance level?

Accepted Answer

H₀: The population has a binomial probabi

Question 5

If the expected frequencies and the observed frequencies are quite different,you are likely to ____________________ the null hypothesis.

Accepted Answer

The answer of If the expected frequencies and the observed...

Question 6

The expected frequency for the cell in row i and column j is the row i total plus the row j total,all divided by n.

Accepted Answer

A) True 
 B)False

Question 7

To calculate the expected values in a test of a contingency table,you assume that the null hypothesis is true.

Accepted Answer

A) True 
 B)False

Question 8

The number of degrees of freedom for a contingency table with 4 rows and 8 columns is

Accepted Answer

A) 32 
B) 12 
C) 21 
D) 10 
A) 32 
B) 12 
C) 21 
D) 10

Question 9

A sports preference poll showed the following data for adults and children:   Use the 5% level of significance and test to determine whether sports preferences depend on age group.

Accepted Answer

H₀: Age group and sports preferences are

Question 10

The null hypothesis in a chi-squared test of a contingency table is that the two nominal variables are ____________________.

Accepted Answer

The answer of The null hypothesis in a chi-squared test...

Question 11

Suppose that two shipping companies,A and B,each decide to estimate the annual percentage of shipments on which a $100 or greater claim for loss or damage was filed by sampling their records,and they report the data shown below.   The owner of Company B is hoping to use these data to show that her company is superior to Company A with regard to the percentage of claims filed.Which test would be used to properly analyze the data in this experiment?

Accepted Answer

A) The χ2 test of a contingency table in a two-way contingency table. 
B) The χ2 goodness-of-fitness test. 
C) The z-test for the difference in two proportions. 
D) The ANOVA F test for main treatment effect. 
A) The χ2 test of a contingency table in a two-way contingency table. 
B) The χ2 goodness-of-fitness test. 
C) The z-test for the difference in two proportions. 
D) The ANOVA F test for main treatment effect.

Question 12

A left tail area in the chi-squared distribution equals .99.For df = 8,the table value equals:

Accepted Answer

A) 20.090 
B) 3.4895 
C) 2.7326 
D) 15.5073 
A) 20.090 
B) 3.4895 
C) 2.7326 
D) 15.5073

Question 13

How do you find the probabilities needed to obtain expected frequencies for a test of a contingency table?

Accepted Answer

A) If there are r rows and c columns,let each probability be 1/rc. 
B) Use the probabilities specified in the null hypothesis. 
C) Assume H0 is true and use your data to calculate them. 
D) None of these choices. 
A) If there are r rows and c columns,let each probability be 1/rc. 
B) Use the probabilities specified in the null hypothesis. 
C) Assume H0 is true and use your data to calculate them. 
D) None of these choices.

Question 14

If we want to perform a two-tail test of a population proportion p,we can only use the z-test of p.

Accepted Answer

A) True 
 B)False

Question 15

The alternative hypothesis in a chi-squared test of a contingency table is that the two nominal variables are ____________________.

Accepted Answer

The answer of The alternative hypothesis in a chi-squared test...

Question 16

If the expected frequency of a cell is less than 5,you should combine cells of the table.

Accepted Answer

A) True 
 B)False

Question 17

Seat Belts 
A study was conducted to determine whether the use of seat belts in vehicles depends on whether or not a child was present in the car.A sample of 1,000 people treated for injuries sustained from vehicle accidents was obtained,and each person was classified according to (1)child present (yes/no)and (2)seat belt usage (worn or not worn)during the accident.The data are shown in the table below.   ​ ​
-{Seat Belts Narrative} How many degrees of freedom are associated with the proper test in this experiment?

Accepted Answer

df = (2 −

Question 18

In a goodness-of-fit test,H0 lists specific values for proportions and the test of a contingency table does not.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following tests does not use the chi-squared distribution?

Accepted Answer

A) Test of a contingency table. 
B) Goodness-of-fit test. 
C) One tailed test for two proportions. 
D) None of these choices. 
A) Test of a contingency table. 
B) Goodness-of-fit test. 
C) One tailed test for two proportions. 
D) None of these choices.

If we want to perform a one-tail test for differences between two populations of nominal data with exactly two categories,we must employ the z-test of p₁ − p₂.

Which of the following tests is appropriate for nominal data if the problem objective is to compare two or more populations and the number of categories is at least 2?

The number of degrees of freedom for a contingency table with r rows and c columns is:

If the expected frequencies and the observed frequencies are quite different,you are likely to ____________________ the null hypothesis.

The expected frequency for the cell in row i and column j is the row i total plus the row j total,all divided by n.

To calculate the expected values in a test of a contingency table,you assume that the null hypothesis is true.

The number of degrees of freedom for a contingency table with 4 rows and 8 columns is

A sports preference poll showed the following data for adults and children: Use the 5% level of significance and test to determine whether sports preferences depend on age group.

The null hypothesis in a chi-squared test of a contingency table is that the two nominal variables are ____________________.

A left tail area in the chi-squared distribution equals .99.For df = 8,the table value equals:

How do you find the probabilities needed to obtain expected frequencies for a test of a contingency table?

If we want to perform a two-tail test of a population proportion p,we can only use the z-test of p.

The alternative hypothesis in a chi-squared test of a contingency table is that the two nominal variables are ____________________.

If the expected frequency of a cell is less than 5,you should combine cells of the table.

In a goodness-of-fit test,H₀ lists specific values for proportions and the test of a contingency table does not.

Which of the following tests does not use the chi-squared distribution?

What Is Statistics

Graphical Descriptive Techniques 1

Graphical Descriptive Techniques 2

Numerical Descriptive Techniques

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Simple Linear Regression and Correlation

Multiple Regression

Model Building

Nonparametric Statistics

Time-Series Analytics and Forecasting

Statistical Process Control

Decision Analysis

Conclusion

Filters

Exam 15: Chi-Squared Tests

If we want to perform a one-tail test for differences between two populations of nominal data with exactly two categories,we must employ the z-test of p1 − p2.

Which of the following tests is appropriate for nominal data if the problem objective is to compare two or more populations and the number of categories is at least 2?

The number of degrees of freedom for a contingency table with r rows and c columns is:

If the expected frequencies and the observed frequencies are quite different,you are likely to ____________________ the null hypothesis.

The expected frequency for the cell in row i and column j is the row i total plus the row j total,all divided by n.

To calculate the expected values in a test of a contingency table,you assume that the null hypothesis is true.

The number of degrees of freedom for a contingency table with 4 rows and 8 columns is

A sports preference poll showed the following data for adults and children: Use the 5% level of significance and test to determine whether sports preferences depend on age group.

The null hypothesis in a chi-squared test of a contingency table is that the two nominal variables are ____________________.

A left tail area in the chi-squared distribution equals .99.For df = 8,the table value equals:

How do you find the probabilities needed to obtain expected frequencies for a test of a contingency table?

If we want to perform a two-tail test of a population proportion p,we can only use the z-test of p.

The alternative hypothesis in a chi-squared test of a contingency table is that the two nominal variables are ____________________.

If the expected frequency of a cell is less than 5,you should combine cells of the table.

In a goodness-of-fit test,H0 lists specific values for proportions and the test of a contingency table does not.

Which of the following tests does not use the chi-squared distribution?

What Is Statistics

Graphical Descriptive Techniques 1

Graphical Descriptive Techniques 2

Numerical Descriptive Techniques

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Simple Linear Regression and Correlation

Multiple Regression

Model Building

Nonparametric Statistics

Time-Series Analytics and Forecasting

Statistical Process Control

Decision Analysis

Conclusion

Filters

If we want to perform a one-tail test for differences between two populations of nominal data with exactly two categories,we must employ the z-test of p₁ − p₂.

In a goodness-of-fit test,H₀ lists specific values for proportions and the test of a contingency table does not.