Question 1

A two-tailed test is used to determine if two population variances differ.The null hypothesis takes the form H0

Accepted Answer

A)    . 
B)    . 
C)    . 
D)    
A)    . 
B)    . 
C)    . 
D)

Question 2

Use the F table to approximate these probabilities.
a.P(F(8,12) ≥ 2.85)
b.P(F(8,12) (5,5) ≥ 7.15)
d.P(F(5,5) < 0.09)

Accepted Answer

We find the value x such that the probab

Question 3

Amie Jackson,a manager at Sigma travel services,makes every effort to ensure that customers attempting to make online reservations do not have to wait too long to complete the reservation process.The travel website is open for reservations 24 hours a day,and Amie regularly checks the website for the waiting time to maintain consistency in service.She uses the following independently drawn samples of wait time during two peak hours,morning 8a.m.to 10 a.m.and evening 7p.m.to 9p.m. ,for the analysis.Assume that wait times are normally distributed.   Which of the following is the correct approximation of the p-value?

Accepted Answer

A)  p-value is greater than 0.1. 
B)  p-value lies between 0.025 and 0.05. 
C)  p-value lies between 0.05 and 0.10. 
D)  p-value is greater than 0.2. 
A)  p-value is greater than 0.1. 
B)  p-value lies between 0.025 and 0.05. 
C)  p-value lies between 0.05 and 0.10. 
D)  p-value is greater than 0.2.

Question 4

The null hypothesis   is rejected if the value of the test statistic exceeds   .

Accepted Answer

A) True 
 B)False

Question 5

Which of the following is the value of x for which

Accepted Answer

A)  20.483 
B)  18.307 
C)  15.987 
D)  4.1680 
A)  20.483 
B)  18.307 
C)  15.987 
D)  4.1680

Question 6

Which of the following is the value of x for which   ?

Accepted Answer

A)  4.07 
B)  5.46 
C)  3.22 
D)  5.39 
A)  4.07 
B)  5.46 
C)  3.22 
D)  5.39

Question 7

Find the value x for which
a.P(   ≥ x)= 0.10.
b.P(   < x)= 0.10.
c.P(   ≥ x)= 0.05.
d.P(   < x)= 0.05.

Accepted Answer

For a @#IMG-DLM& distributed random vari

Question 8

How does the width of the interval respond to the changes in the confidence interval?

Accepted Answer

A)  The width of the interval decreases with an increase in the confidence interval. 
B)  The width of the interval increases with an increase in the confidence interval. 
C)  The width of the interval is halved with the increase in the confidence interval. 
D)  The width of the interval is doubled with the decrease in the confidence interval. 
A)  The width of the interval decreases with an increase in the confidence interval. 
B)  The width of the interval increases with an increase in the confidence interval. 
C)  The width of the interval is halved with the increase in the confidence interval. 
D)  The width of the interval is doubled with the decrease in the confidence interval.

Question 9

Consider the expected returns (in percent)from the two investment options.Beth claims that the variances of the returns for the two investments differ.Use the following data to arrive at the results.   Which of the following is the correct p-value?

Accepted Answer

A)  0.2873 
B)  0.7127 
C)  0.3564 
D)  0.6436 
A)  0.2873 
B)  0.7127 
C)  0.3564 
D)  0.6436

Question 10

Which of the following is the formula for a confidence interval for the ratio of the population variances

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 11

If independent samples of size n1 and n2 are drawn from normal populations with equal variances,then the value of the   statistic is calculated as

Accepted Answer

A)    . 
B)    . 
C)    . 
D)    
A)    . 
B)    . 
C)    . 
D)

A two-tailed test is used to determine if two population variances differ.The null hypothesis takes the form H₀

Use the F table to approximate these probabilities. a.P(F_(8,12) ≥ 2.85) b.P(F_(8,12) < 0.4) c.P(F_(5,5) ≥ 7.15) d.P(F_(5,5) < 0.09)

The null hypothesis is rejected if the value of the test statistic exceeds .

Which of the following is the value of x for which

Which of the following is the value of x for which ?

Find the value x for which a.P( ≥ x)= 0.10. b.P( < x)= 0.10. c.P( ≥ x)= 0.05. d.P( < x)= 0.05.

How does the width of the interval respond to the changes in the confidence interval?

Consider the expected returns (in percent)from the two investment options.Beth claims that the variances of the returns for the two investments differ.Use the following data to arrive at the results. Which of the following is the correct p-value?

Which of the following is the formula for a confidence interval for the ratio of the population variances

If independent samples of size n₁ and n₂ are drawn from normal populations with equal variances,then the value of the statistic is calculated as

Statistics and Data

Tabular and Graphical Methods

Numerical Descriptive Measures

Basic Probability Concepts

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Testing

Statistical Inference Concerning Two Populations

Chi-Square Tests

Analysis of Variance

Regression Analysis

Inference With Regression Models

Regression Models for Nonlinear Relationships

Regression Models With Dummy Variables

Time Series and Forecasting

Returns, Index Numbers and Inflation

Nonparametric Tests

Filters

Exam 11: Statistical Inference Concerning Variance

A two-tailed test is used to determine if two population variances differ.The null hypothesis takes the form H0

Use the F table to approximate these probabilities. a.P(F(8,12) ≥ 2.85) b.P(F(8,12) < 0.4) c.P(F(5,5) ≥ 7.15) d.P(F(5,5) < 0.09)

The null hypothesis is rejected if the value of the test statistic exceeds .

Which of the following is the value of x for which

Which of the following is the value of x for which ?

Find the value x for which a.P( ≥ x)= 0.10. b.P( < x)= 0.10. c.P( ≥ x)= 0.05. d.P( < x)= 0.05.

How does the width of the interval respond to the changes in the confidence interval?

Consider the expected returns (in percent)from the two investment options.Beth claims that the variances of the returns for the two investments differ.Use the following data to arrive at the results. Which of the following is the correct p-value?

Which of the following is the formula for a confidence interval for the ratio of the population variances

If independent samples of size n1 and n2 are drawn from normal populations with equal variances,then the value of the statistic is calculated as

Statistics and Data

Tabular and Graphical Methods

Numerical Descriptive Measures

Basic Probability Concepts

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Testing

Statistical Inference Concerning Two Populations

Chi-Square Tests

Analysis of Variance

Regression Analysis

Inference With Regression Models

Regression Models for Nonlinear Relationships

Regression Models With Dummy Variables

Time Series and Forecasting

Returns, Index Numbers and Inflation

Nonparametric Tests

Filters

A two-tailed test is used to determine if two population variances differ.The null hypothesis takes the form H₀

Use the F table to approximate these probabilities. a.P(F_(8,12) ≥ 2.85) b.P(F_(8,12) < 0.4) c.P(F_(5,5) ≥ 7.15) d.P(F_(5,5) < 0.09)

If independent samples of size n₁ and n₂ are drawn from normal populations with equal variances,then the value of the statistic is calculated as