Exam 9: Hypothesis Tests

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%. -For a two-tailed hypothesis test with a test statistic value of z = 2.05, the p-value is

(Multiple Choice)

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Question 41

When the rejection region is in the lower tail of the sampling distribution, the p-value is the area under the curve

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Question 42

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%. -A sample of 81 account balances of a credit company showed an average balance of $1,200. The population standard deviation is $126. You want to determine if the mean of all account balances is significantly different from $1,150. Use a .05 level of significance.

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Question 43

The level of significance can be any

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Question 44

An official of a large national union claims that the fraction of women in the union is not significantly different from one-half. Using the sample information reported below, carry out a test of this statement. Use a .05 level of significance. $An official of a large national union claims that the fraction of women in the union is not significantly different from one-half. Using the sample information reported below, carry out a test of this statement. Use a .05 level of significance.$

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Question 45

Exhibit 9-3 -Refer to Exhibit 9-3. The test statistic equals

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Question 46

The level of significance is the

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Question 47

A soft drink filling machine, when in perfect adjustment, fills the bottles with 12 ounces of soft drink. A random sample of 25 bottles is selected, and the contents are measured. The sample yielded a mean content of 11.88 ounces, with a standard deviation of 0.24 ounces. With a 0.05 level of significance, test to see if the machine is in perfect adjustment. Assume the distribution of the population is normal.

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Question 48

A carpet company advertises that it will deliver your carpet within 15 days of purchase. A sample of 49 past customers is taken. The average delivery time in the sample was 16.2 days. The population standard deviation is 5.6 days. a.State the null and alternative hypotheses. b.Using a critical value, test the null hypothesis at the 5% level of significance. c.Using a p-value, test the hypothesis at the 5% level of significance. d.Compute the probability of a Type II error if the true average delivery time is 17 days after purchase.

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Question 49

Excel's __________ function can be used to calculate a p-value for a hypothesis test when $\sigma$ is unknown.

(Multiple Choice)

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Question 50

A radio talk show host in Brockdale has complained that the average monthly rent for an efficiency apartment in that city is $600 or more. The Brockdale Landlords Association (BLA) believes that this claim is an exaggeration. BLA takes a random sample of 100 efficiency apartments in the city, inquiring about the monthly rent charged for each. The mean rent for the 100-apartment sample is $592. Conduct a hypothesis test with $\alpha$ = .05 and draw your conclusion using the p-value approach. (Assume the standard deviation for all efficiency apartment rents in this city is known to be about $52.)

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Question 51

If a hypothesis test leads to the rejection of the null hypothesis, a

(Multiple Choice)

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Question 52

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%. -The smaller the p-value,

(Multiple Choice)

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Question 53

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 test statistic is

(Multiple Choice)

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Question 54

Exhibit 9-1 -Refer to Exhibit 9-1. The test statistic equals

(Multiple Choice)

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Question 55

A manufacturer is considering a new production method. The current method produces 94% non-defective (good) parts. The new method will be implemented if it produces more non-defectives than the current method. Identify the hypotheses.

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Question 56

A one-tailed test is a

(Multiple Choice)

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Question 57

If the cost of a Type I error is high, a smaller value should be chosen for the

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Question 58

In the hypothesis testing procedure, $\alpha$ is

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Question 59

When the hypotheses H₀: $\mu$ $\ge$ 100 and H_a: $\mu$ < 100 are being tested at a level of significance of $\alpha$ , the null hypothesis will be rejected if the test statistic z is

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Question 60

Showing 41 - 60 of 118

When the rejection region is in the lower tail of the sampling distribution, the p-value is the area under the curve

The level of significance can be any

Exhibit 9-3 -Refer to Exhibit 9-3. The test statistic equals

The level of significance is the

Excel's __________ function can be used to calculate a p-value for a hypothesis test when $\sigma$ is unknown.

If a hypothesis test leads to the rejection of the null hypothesis, a

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%. -The smaller the p-value,

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 test statistic is

Exhibit 9-1 -Refer to Exhibit 9-1. The test statistic equals

A manufacturer is considering a new production method. The current method produces 94% non-defective (good) parts. The new method will be implemented if it produces more non-defectives than the current method. Identify the hypotheses.

A one-tailed test is a

If the cost of a Type I error is high, a smaller value should be chosen for the

In the hypothesis testing procedure, $\alpha$ is

When the hypotheses H₀: $\mu$ $\ge$ 100 and H_a: $\mu$ < 100 are being tested at a level of significance of $\alpha$ , the null hypothesis will be rejected if the test statistic z 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

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Exam 9: Hypothesis Tests

When the rejection region is in the lower tail of the sampling distribution, the p-value is the area under the curve

The level of significance can be any

An official of a large national union claims that the fraction of women in the union is not significantly different from one-half. Using the sample information reported below, carry out a test of this statement. Use a .05 level of significance.

Exhibit 9-3 -Refer to Exhibit 9-3. The test statistic equals

The level of significance is the

Excel's __________ function can be used to calculate a p-value for a hypothesis test when σ\sigmaσ is unknown.

If a hypothesis test leads to the rejection of the null hypothesis, a

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%. -The smaller the p-value,

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 test statistic is

Exhibit 9-1 -Refer to Exhibit 9-1. The test statistic equals

A manufacturer is considering a new production method. The current method produces 94% non-defective (good) parts. The new method will be implemented if it produces more non-defectives than the current method. Identify the hypotheses.

A one-tailed test is a

If the cost of a Type I error is high, a smaller value should be chosen for the

In the hypothesis testing procedure, α\alphaα is

When the hypotheses H0: μ\muμ ≥\ge≥ 100 and Ha: μ\muμ < 100 are being tested at a level of significance of α\alphaα , the null hypothesis will be rejected if the test statistic z 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

Excel's __________ function can be used to calculate a p-value for a hypothesis test when $\sigma$ is unknown.

In the hypothesis testing procedure, $\alpha$ is

When the hypotheses H₀: $\mu$ $\ge$ 100 and H_a: $\mu$ < 100 are being tested at a level of significance of $\alpha$ , the null hypothesis will be rejected if the test statistic z is