Question 1

There is one, and only one, correct method to perform a hypothesis test procedure.

Accepted Answer

A) True 
 B)False

Question 2

Using z the table found in Table E of Appendix C, the critical value for the right-tailed test with $a = 0.03$ is 1.88.

Accepted Answer

A) True 
 B)False

Question 3

For the conjecture, "The average age of students in this class is 21," the null hypothesis is:

Accepted Answer

A)  We accept the hypothesis that the average age of students in this class is 21 
B)  The average age of students in this class is 21 
C)  The average age of students in this class is not 21 
D)  We reject the hypothesis that he average age of students in this class is 21 
A)  We accept the hypothesis that the average age of students in this class is 21 
B)  The average age of students in this class is 21 
C)  The average age of students in this class is not 21 
D)  We reject the hypothesis that he average age of students in this class is 21

Question 4

A statistician believes that the standard deviation of the weights of firemen is less than 25 pounds. A sample of 20 firemen had a standard deviation of 23.2 pounds. Assume that the variable is normally
Distributed with $a = 0.05$ . What is the critical value?

Accepted Answer

A)  31.410 
B)  30.144 
C)  10.851 
D)  10.117 
A)  31.410 
B)  30.144 
C)  10.851 
D)  10.117

Question 5

The Eagle Ridge Contractors' Association claims the average price of a home in their subdivision is
$125,150, with a standard deviation of $7,350. A sample of 36 homes for sale in this subdivision had an
average selling price of $123,550. Is there evidence that the costs of homes for sale in this subdivision are
actually lower than claimed?
-At a certain university, the average cost of books per student was $390 per student last semester. In a sample of 60 students this semester, their average cost was $425 with a standard deviation of $75.
The Dean of Students believes that the costs are greater this semester. What is the test statistic for this
Hypothesis?

Accepted Answer

A)  0.47 
B)  0.58 
C)  3.61 
D)  28.00 
A)  0.47 
B)  0.58 
C)  3.61 
D)  28.00

Question 6

In a(n) __________, the null hypothesis should be rejected when the test value is in either of the two
critical regions. 
________________________________________

Accepted Answer

The answer of In a(n) __________, the null hypothesis should...

Question 7

A manufacturer claims that his television will have an average lifetime of at least five years. The standard
deviation is seven months. 81 televisions are selected at random, and their average lifetime was found to
be 59 months. Is the manufacturer correct? Use $$\alpha = 0.025$$

Accepted Answer

@#LAT-DLM& television will hav

Question 8

One of the assumptions for the chi-square test for a single variance is that the __________ must be
normally distributed for the variable under study. 
________________________________________

Accepted Answer

The answer of One of the assumptions for the chi-square...

Question 9

We want to test to see if the mean time to complete a task is more than 60 minutes. A random sample of
100 people are selected and $$\text { alpha } = .05$$ If the population standard deviation is 30 minutes, determine the
power of the test if the population mean is 97 minutes.

Accepted Answer

The answer of We want to test to see if...

Question 10

When a researcher fails to reject the null hypothesis, this does not mean that there is enough evidence to
support the __________. 
________________________________________

Accepted Answer

alternativ

There is one, and only one, correct method to perform a hypothesis test procedure.

Using z the table found in Table E of Appendix C, the critical value for the right-tailed test with $a = 0.03$ is 1.88.

For the conjecture, "The average age of students in this class is 21," the null hypothesis is:

A statistician believes that the standard deviation of the weights of firemen is less than 25 pounds. A sample of 20 firemen had a standard deviation of 23.2 pounds. Assume that the variable is normally Distributed with $a = 0.05$ . What is the critical value?

In a(n) , the null hypothesis should be rejected when the test value is in either of the two critical regions. ______________________________

A manufacturer claims that his television will have an average lifetime of at least five years. The standard deviation is seven months. 81 televisions are selected at random, and their average lifetime was found to be 59 months. Is the manufacturer correct? Use $\alpha = 0.025$

One of the assumptions for the chi-square test for a single variance is that the must be normally distributed for the variable under study. ______________________________

We want to test to see if the mean time to complete a task is more than 60 minutes. A random sample of 100 people are selected and $\text { alpha } = .05$ If the population standard deviation is 30 minutes, determine the power of the test if the population mean is 97 minutes.

When a researcher fails to reject the null hypothesis, this does not mean that there is enough evidence to support the . ______________________________

The Nature of Probability and Statistics

Frequency Distributions and Graphs

Data Description

Discrete Probability Distributions

The Normal Distribution

Confidence Intervals and Sample Size

Testing the Difference Between Two Means, Two Proportions, and Two Variances

Correlation and Regression

Chi-Square and Analysis of Variance Anova

Tables

Data Bank

Glossary

Filters

Exam 7: Hypothesis Testing

There is one, and only one, correct method to perform a hypothesis test procedure.

Using z the table found in Table E of Appendix C, the critical value for the right-tailed test with a=0.03a = 0.03a=0.03 is 1.88.

For the conjecture, "The average age of students in this class is 21," the null hypothesis is:

A statistician believes that the standard deviation of the weights of firemen is less than 25 pounds. A sample of 20 firemen had a standard deviation of 23.2 pounds. Assume that the variable is normally Distributed with a=0.05a = 0.05a=0.05 . What is the critical value?

In a(n) __________, the null hypothesis should be rejected when the test value is in either of the two critical regions. ________________________________________

A manufacturer claims that his television will have an average lifetime of at least five years. The standard deviation is seven months. 81 televisions are selected at random, and their average lifetime was found to be 59 months. Is the manufacturer correct? Use α=0.025\alpha = 0.025α=0.025

One of the assumptions for the chi-square test for a single variance is that the __________ must be normally distributed for the variable under study. ________________________________________

We want to test to see if the mean time to complete a task is more than 60 minutes. A random sample of 100 people are selected and alpha =.05\text { alpha } = .05 alpha =.05 If the population standard deviation is 30 minutes, determine the power of the test if the population mean is 97 minutes.

When a researcher fails to reject the null hypothesis, this does not mean that there is enough evidence to support the __________. ________________________________________

The Nature of Probability and Statistics

Frequency Distributions and Graphs

Data Description

Discrete Probability Distributions

The Normal Distribution

Confidence Intervals and Sample Size

Testing the Difference Between Two Means, Two Proportions, and Two Variances

Correlation and Regression

Chi-Square and Analysis of Variance Anova

Tables

Data Bank

Glossary

Filters

Using z the table found in Table E of Appendix C, the critical value for the right-tailed test with $a = 0.03$ is 1.88.

A statistician believes that the standard deviation of the weights of firemen is less than 25 pounds. A sample of 20 firemen had a standard deviation of 23.2 pounds. Assume that the variable is normally Distributed with $a = 0.05$ . What is the critical value?

In a(n) , the null hypothesis should be rejected when the test value is in either of the two critical regions. ______________________________

A manufacturer claims that his television will have an average lifetime of at least five years. The standard deviation is seven months. 81 televisions are selected at random, and their average lifetime was found to be 59 months. Is the manufacturer correct? Use $\alpha = 0.025$

One of the assumptions for the chi-square test for a single variance is that the must be normally distributed for the variable under study. ______________________________

We want to test to see if the mean time to complete a task is more than 60 minutes. A random sample of 100 people are selected and $\text { alpha } = .05$ If the population standard deviation is 30 minutes, determine the power of the test if the population mean is 97 minutes.

When a researcher fails to reject the null hypothesis, this does not mean that there is enough evidence to support the . ______________________________