Question 1

For a lower tail test, the test statistic z is determined to be zero.The p-value for this test is

Accepted Answer

A)  zero. 
B)  -.5. 
C)  +.5. 
D)  1. 
A)  zero. 
B)  -.5. 
C)  +.5. 
D)  1.

Question 2

In the hypothesis testing procedure, α is the

Accepted Answer

A)  level of significance. 
B)  critical value. 
C)  confidence level. 
D)  p-value. 
A)  level of significance. 
B)  critical value. 
C)  confidence level. 
D)  p-value.

Question 3

In a two-tailed hypothesis test situation, the test statistic is determined to be t = -2.032.The sample size is 35.The p-value for this test is

Accepted Answer

A)  -.05. 
B)  +.05. 
C)  -.10. 
D)  +.10. 
A)  -.05. 
B)  +.05. 
C)  -.10. 
D)  +.10.

Question 4

Consider the following hypothesis test:
H0: μ = 10
Ha: μ ≠ 10
A sample of 81 provides a sample mean of 9.5 and a sample standard deviation of 1.8.
a.
Determine the standard error of the mean.
b.
Compute the value of the test statistic.
c.
Determine the p-value; and at the 5% level, test the above hypotheses.

Accepted Answer

​
a.
.2
b.
t = -2.5

Question 5

Read the z statistic from the normal distribution table and choose the correct answer.For a one-tailed test (lower tail) using α = .0901, z =

Accepted Answer

A)  -1.86. 
B)  -1.34. 
C)  -1.96. 
D)  -1.645. 
A)  -1.86. 
B)  -1.34. 
C)  -1.96. 
D)  -1.645.

Question 6

A grocery store has an average sales of $8000 per day.The store introduced several advertising campaigns in order to increase sales.To determine whether or not the advertising campaigns have been effective in increasing sales, a sample of 100 days of sales was selected.It was found that the average was $8200 per day.From past information, it is known that the standard deviation of the population is $1500.The value of the test statistic is

Accepted Answer

A)  .013. 
B)  .133. 
C)  13.33. 
D)  1.33. 
A)  .013. 
B)  .133. 
C)  13.33. 
D)  1.33.

Question 7

The average life expectancy of tires produced by the Whitney Tire Company has been 40,000 miles.Management believes that due to a new production process, the life expectancy of their tires has increased.In order to test the validity of their belief, the correct set of hypotheses is

Accepted Answer

A) H0: μ a: μ 40,000. B) H0: μ 40,000 Ha: μ > 40,000. C) H0: μ > 40,000 Ha: μ 40,000. D) H0: μ 40,000 Ha: μ < 40,000. A) H0: μ a: μ 40,000. B) H0: μ 40,000 Ha: μ > 40,000. C) H0: μ > 40,000 Ha: μ 40,000. D) H0: μ 40,000 Ha: μ < 40,000.

Question 8

A sample of 30 cookies is taken to test the claim that each cookie contains at least 9 chocolate chips.The average number of chocolate chips per cookie in the sample was 7.8 with a standard deviation of 3.
a.
State the null and alternative hypotheses.
b.
Using the critical value approach, test the hypotheses at the 5% level of significance.
c.
Using the p-value approach, test the hypotheses at the 5% level of significance.
d.
Compute the probability of a Type II error if the true number of chocolate chips per cookie is 8.

Accepted Answer

a. H₀: μ @#IMG-DLM& 9 H_a: μ < 9 b. test

Question 9

In order to determine the average price of hotel rooms in Atlanta, a sample of 64 hotels was selected.It was determined that the average price of the rooms in the sample was $108.50 with a standard deviation of $16.
a.
Formulate the hypotheses to determine whether or not the average room price is significantly different from $112.
b.
Compute the test statistic.
c.
Using the p-value approach, test the hypotheses.Let α = .1.

Accepted Answer

a. H₀: μ = $112 H_a:

Question 10

​When the null hypothesis is not rejected, it is​

Accepted Answer

A)  possible a Type I error has occurred. 
B)  possible a Type II error has occurred. 
C)  not possible a Type II error has occurred. 
D)  ​possible either a Type I or a Type II error has occurred. 
A)  possible a Type I error has occurred. 
B)  possible a Type II error has occurred. 
C)  not possible a Type II error has occurred. 
D)  ​possible either a Type I or a Type II error has occurred.

Question 11

If the null hypothesis is rejected at the 5% level of significance, it _____ at the 1% level.

Accepted Answer

A)  will always be rejected 
B)  will always not be rejected 
C)  will never be tested 
D)  may be rejected or not rejected 
A)  will always be rejected 
B)  will always not be rejected 
C)  will never be tested 
D)  may be rejected or not rejected

Question 12

In hypothesis testing, the tentative assumption about the population parameter is

Accepted Answer

A)  the alternative hypothesis. 
B)  the null hypothesis. 
C)  either the null or the alternative. 
D)  neither the null nor the alternative. 
A)  the alternative hypothesis. 
B)  the null hypothesis. 
C)  either the null or the alternative. 
D)  neither the null nor the alternative.

Question 13

As the test statistic becomes larger, the p-value

Accepted Answer

A)  gets smaller. 
B)  becomes larger. 
C)  goes beyond 1. 
D)  becomes negative. 
A)  gets smaller. 
B)  becomes larger. 
C)  goes beyond 1. 
D)  becomes negative.

Question 14

Read the t statistic from the t distribution table and choose the correct answer.For a two-tailed test with a sample size of 20 and using α = .20, t =

Accepted Answer

A)  1.341. 
B)  1.337. 
C)  .865. 
D)  .866. 
A)  1.341. 
B)  1.337. 
C)  .865. 
D)  .866.

Question 15

The power curve provides the probability of

Accepted Answer

A)  correctly accepting the null hypothesis. 
B)  incorrectly accepting the null hypothesis. 
C)  incorrectly rejecting the null hypothesis. 
D)  correctly rejecting the null hypothesis. 
A)  correctly accepting the null hypothesis. 
B)  incorrectly accepting the null hypothesis. 
C)  incorrectly rejecting the null hypothesis. 
D)  correctly rejecting the null hypothesis.

Question 16

A law enforcement agent believes that at least 88% of the drivers stopped for speeding on Saturday nights are under the influence of alcohol.A sample of 66 drivers who were stopped for speeding on a Saturday night was taken.Eighty percent of the drivers in the sample were under the influence of alcohol.
a.
State the null and alternative hypotheses.
b.
Compute the test statistic.
c.
Using the p-value approach, test the hypotheses at the .05 level of significance.

Accepted Answer

a. H₀: p @#IMG-DLM& .88 H_a: p

Question 17

When the p-value is used for hypothesis testing, the null hypothesis is rejected if

Accepted Answer

A)  p-value   α. 
B)  α < p-value. 
C)  p-value = 1 - α/2. 
D)  p-value = 1 - α. 
A)  p-value   α. 
B)  α < p-value. 
C)  p-value = 1 - α/2. 
D)  p-value = 1 - α.

Question 18

A sample of 81 account balances of a credit company showed an average balance of $1200 with a standard deviation of $126.
a.
Formulate the hypotheses that can be used to determine whether the mean of all account balances is significantly different from $1150.
b.
Compute the test statistic.
c.
Using the p-value approach, what is your conclusion? Let α = .05.

Accepted Answer

a. H₀: μ = $1150 H_a: μ ≠ $1150

Question 19

Confirmed cases of West Nile virus in birds for a sample of six counties in the state of Georgia are shown below.Assume the population is normally distributed.   ​
We are interested in testing the following hypotheses regarding these data:
​
H0: μ   3
Ha: μ > 3 
a.
Compute the mean and the standard deviation of the sample.
b.
Compute the standard error of the mean.
c.
Determine the test statistic.
d.
Determine the p-value; and using α = .10, test the hypotheses.What is your conclusion?

Accepted Answer

​
a.
4 and 1.265 (rounded)
b.

Question 20

​In hypothesis testing, the critical value is

Accepted Answer

A)  ​a number that establishes the boundary of the rejection region. 
B)  ​the probability of a Type I error. 
C)  ​the probability of a Type II error. 
D)  ​the same as the p-value. 
A)  ​a number that establishes the boundary of the rejection region. 
B)  ​the probability of a Type I error. 
C)  ​the probability of a Type II error. 
D)  ​the same as the p-value.

For a lower tail test, the test statistic z is determined to be zero.The p-value for this test is

In the hypothesis testing procedure, α is the

In a two-tailed hypothesis test situation, the test statistic is determined to be t = -2.032.The sample size is 35.The p-value for this test is

Read the z statistic from the normal distribution table and choose the correct answer.For a one-tailed test (lower tail) using α = .0901, z =

The average life expectancy of tires produced by the Whitney Tire Company has been 40,000 miles.Management believes that due to a new production process, the life expectancy of their tires has increased.In order to test the validity of their belief, the correct set of hypotheses is

When the null hypothesis is not rejected, it is

If the null hypothesis is rejected at the 5% level of significance, it _____ at the 1% level.

In hypothesis testing, the tentative assumption about the population parameter is

As the test statistic becomes larger, the p-value

Read the t statistic from the t distribution table and choose the correct answer.For a two-tailed test with a sample size of 20 and using α = .20, t =

The power curve provides the probability of

When the p-value is used for hypothesis testing, the null hypothesis is rejected if

In hypothesis testing, the critical value is

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Comparing Multiple Proportions, Tests of Independence and Goodness of Fit

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Filters

Exam 9: Hypothesis Tests

For a lower tail test, the test statistic z is determined to be zero.The p-value for this test is

In the hypothesis testing procedure, α is the

In a two-tailed hypothesis test situation, the test statistic is determined to be t = -2.032.The sample size is 35.The p-value for this test is

Read the z statistic from the normal distribution table and choose the correct answer.For a one-tailed test (lower tail) using α = .0901, z =

The average life expectancy of tires produced by the Whitney Tire Company has been 40,000 miles.Management believes that due to a new production process, the life expectancy of their tires has increased.In order to test the validity of their belief, the correct set of hypotheses is

​When the null hypothesis is not rejected, it is​

If the null hypothesis is rejected at the 5% level of significance, it _____ at the 1% level.

In hypothesis testing, the tentative assumption about the population parameter is

As the test statistic becomes larger, the p-value

Read the t statistic from the t distribution table and choose the correct answer.For a two-tailed test with a sample size of 20 and using α = .20, t =

The power curve provides the probability of

When the p-value is used for hypothesis testing, the null hypothesis is rejected if

​In hypothesis testing, the critical value is

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Comparing Multiple Proportions, Tests of Independence and Goodness of Fit

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Filters

When the null hypothesis is not rejected, it is

In hypothesis testing, the critical value is