Question 1

What does the term expected cell frequencies refer to?

Accepted Answer

A) The frequencies found in the population being examined 
B) The frequencies found in the sample being examined 
C) The frequencies computed from H0 
D) the frequencies computed from H1 
A) The frequencies found in the population being examined 
B) The frequencies found in the sample being examined 
C) The frequencies computed from H0 
D) the frequencies computed from H1

Question 2

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 these data,conduct a goodness-of-fit test using a 0.10 level of significance.Which conclusion is correct?

Accepted Answer

A) Arrivals are not uniformly distributed over the weekday because (test statistic)> (critical value). B) Arrivals are uniformly distributed over the weekday because (test statistic)> (critical value). C) Arrivals are not uniformly distributed over the weekday because (test statistic)< (critical value). D) Arrives are uniformly distributed over the weekday because (test statistic)< (critical value). A) Arrivals are not uniformly distributed over the weekday because (test statistic)> (critical value). B) Arrivals are uniformly distributed over the weekday because (test statistic)> (critical value). C) Arrivals are not uniformly distributed over the weekday because (test statistic)< (critical value). D) Arrives are uniformly distributed over the weekday because (test statistic)< (critical value).

Question 3

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 4

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 5

Unlike the case of goodness-of-fit testing,with contingency analysis there is no restriction on the minimum size for an expected cell frequency.

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

A cell phone company wants to determine if the use of text messaging is independent of age.The follow data has been collected from a random sample of their customers.   Using the data above,in order to test for the independence of age and the use of text messaging,the expected value for the "under 21 and regularly use text messaging" cell is 82.

Accepted Answer

A) True 
 B)False

Question 8

Contingency analysis helps to make decisions when multiple proportions are involved.

Accepted Answer

A) True 
 B)False

Question 9

A study was recently conducted in which people were asked to indicate which news medium was their preferred choice for national news.The following data were observed:   Given this data,if we wish to test whether the preferred news source is independent of age,for an alpha = .05 level,the test statistic is computed to be approximately 40.70.

Accepted Answer

A) True 
 B)False

Question 10

To employ contingency analysis,we set up a 2-dimensional table called a contingency table.

Accepted Answer

A) True 
 B)False

Question 11

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 test statistic for determining whether having a laptop is independent of gender is approximately 14.23.

Accepted Answer

A) True 
 B)False

Question 12

A lube and oil change business believes that the number of cars that arrive for service is the same each day of the week.If the business is open six days a week (Monday - Saturday)and a random sample of n = 200 customers is selected,the sum of the expected frequencies over the six days cannot be determined without seeing the actual sample data.

Accepted Answer

A) True 
 B)False

Question 13

The degrees of freedom for the chi-square goodness-of-fit test are equal to ________,where k is the number of categories.

Accepted Answer

A) k+1 
B) k-1 
C) k+2 
D) k-2 
A) k+1 
B) k-1 
C) k+2 
D) k-2

Question 14

We want to test whether type of car owned (domestic or foreign)is independent of gender.A contingence table is obtained from a sample of 990 people as   At alpha = 0.05 level,we conclude that

Accepted Answer

A)    = 3.34 and type of car owned is independent of gender. 
B)    = 3.34 and type of car owned is dependent of gender. 
C)    = 3.84 and type of car owned is independent of gender. 
D)    = 3.84 and type of car owned is dependent of gender. 
A)    = 3.34 and type of car owned is independent of gender. 
B)    = 3.34 and type of car owned is dependent of gender. 
C)    = 3.84 and type of car owned is independent of gender. 
D)    = 3.84 and type of car owned is dependent of gender.

Question 15

A study was recently done in the United States in which car owners were asked to indicate whether their most recent car purchase was a U.S.car,a German car,or a Japanese car.The people in the survey were divided by geographic region in the United States.The following data were recorded.   Given this situation,to test whether the car origin is independent of the geographical location of the buyer,the expected number of people in the sample who bought a German made car and who lived on the East Coast is just under 40 people.

Accepted Answer

A) True 
 B)False

Question 16

Explain why,in performing a goodness-of-fit test,it is sometimes necessary to combine categories.

Accepted Answer

Because of the way in which the chi-squa

Question 17

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 18

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 19

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 based on a 0.05 level of significance is 9.4877.

Accepted Answer

A) True 
 B)False

Question 20

In a goodness-of-fit test,when the null hypothesis is true,the expected value for the chi-square test statistic is zero.

Accepted Answer

A) True 
 B)False

What does the term expected cell frequencies refer to?

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 these data,conduct a goodness-of-fit test using a 0.10 level of significance.Which conclusion is correct?

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

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

Unlike the case of goodness-of-fit testing,with contingency analysis there is no restriction on the minimum size for an expected cell frequency.

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

Contingency analysis helps to make decisions when multiple proportions are involved.

To employ contingency analysis,we set up a 2-dimensional table called a contingency table.

The degrees of freedom for the chi-square goodness-of-fit test are equal to ________,where k is the number of categories.

We want to test whether type of car owned (domestic or foreign)is independent of gender.A contingence table is obtained from a sample of 990 people as At alpha = 0.05 level,we conclude that

Explain why,in performing a goodness-of-fit test,it is sometimes necessary to combine categories.

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

In a goodness-of-fit test,when the null hypothesis is true,the expected value for the chi-square test statistic is zero.

The Where, why, and How of Data Collection

Graphs,charts and Tablesdescribing Your Data

Describing Data Using Numerical Measures

Using Probability and Probability Distributions

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

Introduction to Decision Analysis

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

What does the term expected cell frequencies refer to?

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

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

Unlike the case of goodness-of-fit testing,with contingency analysis there is no restriction on the minimum size for an expected cell frequency.

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

Contingency analysis helps to make decisions when multiple proportions are involved.

To employ contingency analysis,we set up a 2-dimensional table called a contingency table.

The degrees of freedom for the chi-square goodness-of-fit test are equal to ________,where k is the number of categories.

We want to test whether type of car owned (domestic or foreign)is independent of gender.A contingence table is obtained from a sample of 990 people as At alpha = 0.05 level,we conclude that

Explain why,in performing a goodness-of-fit test,it is sometimes necessary to combine categories.

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

In a goodness-of-fit test,when the null hypothesis is true,the expected value for the chi-square test statistic is zero.

The Where, why, and How of Data Collection

Graphs,charts and Tablesdescribing Your Data

Describing Data Using Numerical Measures

Using Probability and Probability Distributions

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

Introduction to Decision Analysis

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