Question 1

The degrees of freedom for a contingency table with 11 rows and 10 columns is:

Accepted Answer

A) 11 
B) 10 
C) 110 
D) 90 
A) 11 
B) 10 
C) 110 
D) 90 D

Question 2

A study published in the American Journal of Public Health was conducted to determine whether the use of seat belts in motor vehicles depends on ethnic status in San Diego County.A sample of 792 children treated for injuries sustained from motor vehicle accidents was obtained,and each child was classified according to (1)ethnic status (Hispanic or non-Hispanic)and (2)seat belt usage (worn or not worn)during the accident.The number of children in each category is given in the table below.   Referring to these data,which test would be used to properly analyze the data in this experiment?

Accepted Answer

A) x2 test for independence in a two-way contingency table 
B) x2 test for equal proportions in a one-way table 
C) ANOVA F-test for interaction in a 2 × 2 factorial design 
D) x2 goodness-of-fit test 
A) x2 test for independence in a two-way contingency table 
B) x2 test for equal proportions in a one-way table 
C) ANOVA F-test for interaction in a 2 × 2 factorial design 
D) x2 goodness-of-fit test A

Question 3

A survey was recently conducted in which males and females were asked whether they owned a laptop personal computer.The following data were observed:
   Given this information,if an alpha level of .05 is used,the critical value for testing whether the two variables are independent is x2 = 3.8415.

Accepted Answer

A) True 
 B)False  True

Question 4

A contingency table and a cross-tabulation table are two separate things and should not be used for the same purpose.

Accepted Answer

A) True 
 B)False

Question 5

A business with 5 copy machines keeps track of how many copy machines need service on a given day.It believes this is binomially distributed with a probability of p = 0.2 of each machine needing service on any given day.It has collected the following based on a random sample of 100 days.
   Given this information,assuming that all expected values are sufficiently large to use the classes as shown above,the critical value for testing the hypothesis will be based on 5 degrees of freedom.

Accepted Answer

A) True 
 B)False

Question 6

A chi-square test for goodness-of-fit is used to test whether or not there are any preferences among 3 brands of peas.If the study uses a sample of n = 60 subjects,then the expected frequency for each category would be:

Accepted Answer

A) 20 
B) 30 
C) 60 
D) 33 
A) 20 
B) 30 
C) 60 
D) 33

Question 7

When testing for independence in a contingency table with 3 rows and 4 columns,there are ________ degrees of freedom.

Accepted Answer

A) 5 
B) 6 
C) 7 
D) 12 
A) 5 
B) 6 
C) 7 
D) 12

Question 8

If the null hypothesis is not rejected,you do not need to worry when the expected cell frequencies drop below 5.0

Accepted Answer

A) True 
 B)False

Question 9

A walk-in medical clinic believes that arrivals are uniformly distributed over weekdays (Monday through Friday).It has collected the following data based on a random sample of 100 days.   Based on this information how many degrees for freedom are involved in this goodness of fit test?

Accepted Answer

A) 99 
B) 100 
C) 4 
D) 5 
A) 99 
B) 100 
C) 4 
D) 5

Question 10

We are interested in determining whether the opinions of the individuals on gun control (as to Yes,No,and No Opinion)are uniformly distributed. A sample of 150 was taken and the following data were obtained.
  The conclusion of the test with alpha = 0.05 is that the views of people on gun control are:

Accepted Answer

A) uniformly distributed. 
B) not uniformly distributed. 
C) inconclusive. 
D) None of the above 
A) uniformly distributed. 
B) not uniformly distributed. 
C) inconclusive. 
D) None of the above

Question 11

In performing chi-square contingency analysis,to overcome a small expected cell frequency problem,we:

Accepted Answer

A) combine the categories of the row and/or column variables. 
B) increase the sample size. 
C) Both A and B 
D) None of the above 
A) combine the categories of the row and/or column variables. 
B) increase the sample size. 
C) Both A and B 
D) None of the above

Question 12

In a contingency analysis,the greater the difference between the actual and the expected frequencies,the more likely:

Accepted Answer

A) H0 should be rejected. 
B) H0 should be accepted. 
C) we cannot determine H0. 
D) the smaller the test statistic will be. 
A) H0 should be rejected. 
B) H0 should be accepted. 
C) we cannot determine H0. 
D) the smaller the test statistic will be.

Question 13

A cell phone company wants to determine if the use of text messaging is independent of age.The following data has been collected from a random sample of customers.
   Using this data,if we wish to test whether the preferred news source is independent of age using a 0.05 level of significance,the critical value is 5.9915.

Accepted Answer

A) True 
 B)False

Question 14

If the test statistic for a chi-square goodness-of-fit test is larger than the critical value,the null hypothesis should be rejected.

Accepted Answer

A) True 
 B)False

Question 15

A survey was recently conducted in which males and females were asked whether they owned a laptop personal computer.The following data were observed:
   Given this information,if having a laptop is independent of gender,the expected number of males with laptops in this survey is 150.

Accepted Answer

A) True 
 B)False

Question 16

It is believed that the number of drivers who are ticketed for speeding on a particular stretch of highway is a Poisson distribution with a mean of 3.5 per hour.A random sample of 100 hours is selected with the following results:
   Given this information,it can be seen that the cells will need to be combined since the actual number of occurrences at some levels of x is less than 5.

Accepted Answer

A) True 
 B)False

Question 17

A goodness-of-fit test can decide whether a set of data comes from a specific hypothesized distribution.

Accepted Answer

A) True 
 B)False

Question 18

In a goodness-of-fit test about a population distribution,if one or more parameters are left unspecified in H0,they must be estimated from the sample data.This will reduce the degrees of freedom by ________ for each estimated parameter.

Accepted Answer

A) 1 
B) 2 
C) 3 
D) None of the above 
A) 1 
B) 2 
C) 3 
D) None of the above

Question 19

If the calculated chi-square statistic is large,this is evidence to suggest the fit of the actual data to the hypothesized distribution is not good,and H0 should be rejected.

Accepted Answer

A) True 
 B)False

Question 20

The goodness-of-fit test is essentially determining if the test statistic is significantly larger than zero.

Accepted Answer

A) True 
 B)False

The degrees of freedom for a contingency table with 11 rows and 10 columns is:

A survey was recently conducted in which males and females were asked whether they owned a laptop personal computer.The following data were observed: Given this information,if an alpha level of .05 is used,the critical value for testing whether the two variables are independent is x² = 3.8415.

A contingency table and a cross-tabulation table are two separate things and should not be used for the same purpose.

A chi-square test for goodness-of-fit is used to test whether or not there are any preferences among 3 brands of peas.If the study uses a sample of n = 60 subjects,then the expected frequency for each category would be:

When testing for independence in a contingency table with 3 rows and 4 columns,there are ________ degrees of freedom.

If the null hypothesis is not rejected,you do not need to worry when the expected cell frequencies drop below 5.0

A walk-in medical clinic believes that arrivals are uniformly distributed over weekdays (Monday through Friday).It has collected the following data based on a random sample of 100 days. Based on this information how many degrees for freedom are involved in this goodness of fit test?

We are interested in determining whether the opinions of the individuals on gun control (as to Yes,No,and No Opinion)are uniformly distributed. A sample of 150 was taken and the following data were obtained. The conclusion of the test with alpha = 0.05 is that the views of people on gun control are:

In performing chi-square contingency analysis,to overcome a small expected cell frequency problem,we:

In a contingency analysis,the greater the difference between the actual and the expected frequencies,the more likely:

If the test statistic for a chi-square goodness-of-fit test is larger than the critical value,the null hypothesis should be rejected.

A survey was recently conducted in which males and females were asked whether they owned a laptop personal computer.The following data were observed: Given this information,if having a laptop is independent of gender,the expected number of males with laptops in this survey is 150.

A goodness-of-fit test can decide whether a set of data comes from a specific hypothesized distribution.

In a goodness-of-fit test about a population distribution,if one or more parameters are left unspecified in H₀,they must be estimated from the sample data.This will reduce the degrees of freedom by ________ for each estimated parameter.

If the calculated chi-square statistic is large,this is evidence to suggest the fit of the actual data to the hypothesized distribution is not good,and H₀ should be rejected.

The goodness-of-fit test is essentially determining if the test statistic is significantly larger than zero.

The Where,Why,and How of Data Collection

Graphs,Charts and Tablesdescribing Your Data

Describing Data Using Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Introduction to Continuous Probability Distributions

Introduction to Sampling Distributions

Estimating Single Population Parameters

Introduction to Hypothesis Testing

Estimation and Hypothesis Testing for Two Population Parameters

Hypothesis Tests and Estimation for Population Variances

Analysis of Variance

Introduction to Linear Regression and Correlation Analysis

Multiple Regression Analysis and Model Building

Analyzing and Forecasting Time-Series Data

Introduction to Nonparametric Statistics

Introduction to Quality and Statistical Process Control

Filters

Exam 13: Goodness-Of-Fit Tests and Contingency Analysis

The degrees of freedom for a contingency table with 11 rows and 10 columns is:

A survey was recently conducted in which males and females were asked whether they owned a laptop personal computer.The following data were observed: Given this information,if an alpha level of .05 is used,the critical value for testing whether the two variables are independent is x2 = 3.8415.

A contingency table and a cross-tabulation table are two separate things and should not be used for the same purpose.

A chi-square test for goodness-of-fit is used to test whether or not there are any preferences among 3 brands of peas.If the study uses a sample of n = 60 subjects,then the expected frequency for each category would be:

When testing for independence in a contingency table with 3 rows and 4 columns,there are ________ degrees of freedom.

If the null hypothesis is not rejected,you do not need to worry when the expected cell frequencies drop below 5.0

A walk-in medical clinic believes that arrivals are uniformly distributed over weekdays (Monday through Friday).It has collected the following data based on a random sample of 100 days. Based on this information how many degrees for freedom are involved in this goodness of fit test?

In performing chi-square contingency analysis,to overcome a small expected cell frequency problem,we:

In a contingency analysis,the greater the difference between the actual and the expected frequencies,the more likely:

If the test statistic for a chi-square goodness-of-fit test is larger than the critical value,the null hypothesis should be rejected.

A survey was recently conducted in which males and females were asked whether they owned a laptop personal computer.The following data were observed: Given this information,if having a laptop is independent of gender,the expected number of males with laptops in this survey is 150.

A goodness-of-fit test can decide whether a set of data comes from a specific hypothesized distribution.

In a goodness-of-fit test about a population distribution,if one or more parameters are left unspecified in H0,they must be estimated from the sample data.This will reduce the degrees of freedom by ________ for each estimated parameter.

If the calculated chi-square statistic is large,this is evidence to suggest the fit of the actual data to the hypothesized distribution is not good,and H0 should be rejected.

The goodness-of-fit test is essentially determining if the test statistic is significantly larger than zero.

The Where,Why,and How of Data Collection

Graphs,Charts and Tablesdescribing Your Data

Describing Data Using Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Introduction to Continuous Probability Distributions

Introduction to Sampling Distributions

Estimating Single Population Parameters

Introduction to Hypothesis Testing

Estimation and Hypothesis Testing for Two Population Parameters

Hypothesis Tests and Estimation for Population Variances

Analysis of Variance

Introduction to Linear Regression and Correlation Analysis

Multiple Regression Analysis and Model Building

Analyzing and Forecasting Time-Series Data

Introduction to Nonparametric Statistics

Introduction to Quality and Statistical Process Control

Filters

A survey was recently conducted in which males and females were asked whether they owned a laptop personal computer.The following data were observed: Given this information,if an alpha level of .05 is used,the critical value for testing whether the two variables are independent is x² = 3.8415.

In a goodness-of-fit test about a population distribution,if one or more parameters are left unspecified in H₀,they must be estimated from the sample data.This will reduce the degrees of freedom by ________ for each estimated parameter.

If the calculated chi-square statistic is large,this is evidence to suggest the fit of the actual data to the hypothesized distribution is not good,and H₀ should be rejected.