A) probability, when the null hypothesis is true, of obtaining a sample result that is at least as unlikely as what is observed B) value of the test statistic C) probability of a Type II error D) probability corresponding to the critical value(s) in a hypothesis test A) probability, when the null hypothesis is true, of obtaining a sample result that is at least as unlikely as what is observed B) value of the test statistic C) probability of a Type II error D) probability corresponding to the critical value(s) in a hypothesis test

In tests about a population proportion, p0 represents the

A) hypothesized population proportion B) observed sample proportion C) observed p-value D) probability of A) hypothesized population proportion B) observed sample proportion C) observed p-value D) probability of

More evidence against H0 is indicated by

A) lower levels of significance B) smaller p-values C) smaller critical values D) lower probabilities of a Type II error A) lower levels of significance B) smaller p-values C) smaller critical values D) lower probabilities of a Type II error

Exam 9: Hypothesis Tests

Several years ago the proportion of Americans aged 18 - 24 who invested in the stock market was 0.20. A random sample of 25 Americans in this age group was recently taken. They were asked whether or not they invested in the stock market. The results follow: At a .05 level of significance, use Excel to determine whether or not the proportion of Americans 18 - 24 years old that invest in the stock market has changed.

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Question 21

A p-value is the

(Multiple Choice)

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Question 22

Which of the following is an improper form of the null and alternative hypotheses?

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Question 23

Fast 'n Clean operates 12 laundromats on the east side of the city. All of Fast 'n Clean's clothes dryers have a label stating "20 minutes for $1.00." You question the accuracy of the dryers' clocks and decide to conduct an observational study. You randomly select 36 dryers in several different Fast 'n Clean locations, put $1.00 in each and time the drying cycle. The sample mean drying time is 20 minutes and 25 seconds. The manufacturer of the dryer states that the standard deviation for 20-minute drying cycles is 1 minute. a. Using the sample data and $\alpha$ = .05, test the validity of the label on the dryers. Apply the p-value and critical value approaches to conducting the two-tail hypothesis test. b. Conduct the same two-tail hypothesis test, but this time use the confidence interval approach to hypothesis testing.

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Question 24

For a sample size of 30, changing from using the standard normal distribution to using the t distribution in a hypothesis test,

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Question 25

A student believes that the average grade on the final examination in statistics is at least 85. She plans on taking a sample to test her belief. The correct set of hypotheses is

(Multiple Choice)

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Question 26

Exhibit 9-4 A random sample of 16 students selected from the student body of a large university had an average age of 25 years. We want to determine if the average age of all the students at the university is significantly different from 24. Assume the distribution of the population of ages is normal with a standard deviation of 2 years. -Refer to Exhibit 9-4. The test statistic is

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Question 27

Which of the following does not need to be known in order to compute the p-value?

(Multiple Choice)

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Question 28

In order to test the hypotheses H₀: $\mu$ $\le$ 100 and H_a: $\mu$ > 100 at an $\alpha$ level of significance, the null hypothesis will be rejected if the test statistic z is

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Question 29

In tests about a population proportion, p₀ represents the

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Question 30

Nancy believes that the average running time of movies is equal to 140 minutes. A sample of 4 movies was taken and the following running times were obtained. Assume the distribution of the population is normally distributed. a.State the null and alternative hypotheses. b.Using a critical value, test the hypothesis at the 10% level of significance. c.Using a p-value, test the hypothesis at the 10% level of significance. d.Using a confidence interval, test the hypothesis at the 10% level of significance. e.Could a Type II error have been committed in this hypothesis test?

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Question 31

Exhibit 9-5 Assume population is normally distributed. -Refer to Exhibit 9-5. The test statistic equals

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Question 32

Exhibit 9-6 A random sample of 100 people was taken. Eighty of the people in the sample favored Candidate A. We are interested in determining whether or not the proportion of the population in favor of Candidate A is significantly more than 75%. -Refer to Exhibit 9-6. The p-value is

(Multiple Choice)

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Question 33

Exhibit 9-6 A random sample of 100 people was taken. Eighty of the people in the sample favored Candidate A. We are interested in determining whether or not the proportion of the population in favor of Candidate A is significantly more than 75%. -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 $112. The population standard deviation is known to be $16. Use a 0.05 level of significance and determine whether or not the average room price is significantly different from $108.50.

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Question 34

In hypothesis testing, the alternative hypothesis is

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Question 35

Two approaches to drawing a conclusion in a hypothesis test are

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Question 36

Read the z statistics from the normal distribution table and circle the correct answer. A two-tailed test at a .0694 level of significance; z =

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Question 37

Exhibit 9-5 Assume population is normally distributed. -Refer to Exhibit 9-5. If the test is done at a 2% level of significance, the null hypothesis should

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Question 38

More evidence against H₀ is indicated by

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Question 39

The error of rejecting a true null hypothesis is

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Question 40

Showing 21 - 40 of 118

A p-value is the

Which of the following is an improper form of the null and alternative hypotheses?

For a sample size of 30, changing from using the standard normal distribution to using the t distribution in a hypothesis test,

A student believes that the average grade on the final examination in statistics is at least 85. She plans on taking a sample to test her belief. The correct set of hypotheses is

Which of the following does not need to be known in order to compute the p-value?

In order to test the hypotheses H₀: $\mu$ $\le$ 100 and H_a: $\mu$ > 100 at an $\alpha$ level of significance, the null hypothesis will be rejected if the test statistic z is

In tests about a population proportion, p₀ represents the

Exhibit 9-5 Assume population is normally distributed. -Refer to Exhibit 9-5. The test statistic equals

Exhibit 9-6 A random sample of 100 people was taken. Eighty of the people in the sample favored Candidate A. We are interested in determining whether or not the proportion of the population in favor of Candidate A is significantly more than 75%. -Refer to Exhibit 9-6. The p-value is

In hypothesis testing, the alternative hypothesis is

Two approaches to drawing a conclusion in a hypothesis test are

Read the z statistics from the normal distribution table and circle the correct answer. A two-tailed test at a .0694 level of significance; z =

Exhibit 9-5 Assume population is normally distributed. -Refer to Exhibit 9-5. If the test is done at a 2% level of significance, the null hypothesis should

More evidence against H₀ is indicated by

The error of rejecting a true null hypothesis 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

Tests of Goodness of Fit, Independence and Multiple Proportions

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters

Exam 9: Hypothesis Tests

A p-value is the

Which of the following is an improper form of the null and alternative hypotheses?

For a sample size of 30, changing from using the standard normal distribution to using the t distribution in a hypothesis test,

A student believes that the average grade on the final examination in statistics is at least 85. She plans on taking a sample to test her belief. The correct set of hypotheses is

Which of the following does not need to be known in order to compute the p-value?

In order to test the hypotheses H0: μ\muμ ≤\le≤ 100 and Ha: μ\muμ > 100 at an α\alphaα level of significance, the null hypothesis will be rejected if the test statistic z is

In tests about a population proportion, p0 represents the

Exhibit 9-5 Assume population is normally distributed. -Refer to Exhibit 9-5. The test statistic equals

Exhibit 9-6 A random sample of 100 people was taken. Eighty of the people in the sample favored Candidate A. We are interested in determining whether or not the proportion of the population in favor of Candidate A is significantly more than 75%. -Refer to Exhibit 9-6. The p-value is

In hypothesis testing, the alternative hypothesis is

Two approaches to drawing a conclusion in a hypothesis test are

Read the z statistics from the normal distribution table and circle the correct answer. A two-tailed test at a .0694 level of significance; z =

Exhibit 9-5 Assume population is normally distributed. -Refer to Exhibit 9-5. If the test is done at a 2% level of significance, the null hypothesis should

More evidence against H0 is indicated by

The error of rejecting a true null hypothesis 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

Tests of Goodness of Fit, Independence and Multiple Proportions

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters

In order to test the hypotheses H₀: $\mu$ $\le$ 100 and H_a: $\mu$ > 100 at an $\alpha$ level of significance, the null hypothesis will be rejected if the test statistic z is

In tests about a population proportion, p₀ represents the

More evidence against H₀ is indicated by