Exam 10: Comparisons Involving Means, Experimental Design and Analysis of Variance

Information regarding random samples of annual salaries (in thousands of dollars) of doctors in three different specialties is shown below. a.Compute the overall mean. b.State the null and alternative hypotheses to be tested. c.Show the complete ANOVA table for this test including the test statistic. d.The null hypothesis is to be tested at 95% confidence. Determine the critical value for this test. What do you conclude? e. Determine the p-value and use it for the test.

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Question 201

If we are interested in testing whether the mean of items in population 1 is significantly smaller than the mean of items in population 2, the

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Question 202

The test scores for selected samples of sociology students who took the course from three different instructors are shown below. $The test scores for selected samples of sociology students who took the course from three different instructors are shown below. At \alpha = 0.05, test to see if there is a significant difference among the averages of the three groups. Use both the critical value and p-value approaches.$ At $\alpha$ = 0.05, test to see if there is a significant difference among the averages of the three groups. Use both the critical value and p-value approaches.

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Question 203

Exhibit 10-3 A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today and those enrolled five years ago. A sample of final examination scores from students enrolled today and from students enrolled five years ago was taken. You are given the following information. -Refer to Exhibit 10-3. The point estimate for the difference between the means of the two populations is

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Question 204

The following shows the monthly sales in units of six salespersons before and after a bonus plan was introduced. At 95% confidence, determine whether the bonus plan has increased sales significantly. (For the following matched samples, let the difference "d" be: d = after - before.)

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Question 205

Independent random samples of managers' yearly salaries (in $1000) taken from governmental and private organizations provided the following information. At 95% confidence, test to determine if there is a significant difference between the average salaries of the managers in the two sectors.

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Question 206

Independent simple random samples are taken to test the difference between the means of two populations whose variances are not known, but are assumed to be equal. The sample sizes are n₁ = 32 and n₂ = 40. The correct distribution to use is the

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Question 207

Exhibit 10-2 The following information was obtained from matched samples. The daily production rates for a sample of workers before and after a training program are shown below. $Exhibit 10-2 The following information was obtained from matched samples. The daily production rates for a sample of workers before and after a training program are shown below. -Refer to Exhibit 10-2. The null hypothesis to be tested is H<sub>0</sub>: \mu <sub>d</sub> = 0. The test statistic is$ -Refer to Exhibit 10-2. The null hypothesis to be tested is H₀: $\mu$ _d = 0. The test statistic is

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Question 208

Showing 201 - 208 of 208

If we are interested in testing whether the mean of items in population 1 is significantly smaller than the mean of items in population 2, the

The following shows the monthly sales in units of six salespersons before and after a bonus plan was introduced. At 95% confidence, determine whether the bonus plan has increased sales significantly. (For the following matched samples, let the difference "d" be: d = after - before.)

Independent random samples of managers' yearly salaries (in $1000) taken from governmental and private organizations provided the following information. At 95% confidence, test to determine if there is a significant difference between the average salaries of the managers in the two sectors.

Independent simple random samples are taken to test the difference between the means of two populations whose variances are not known, but are assumed to be equal. The sample sizes are n₁ = 32 and n₂ = 40. The correct distribution to use is the

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Descriptive Statistics: Numerical Measures

Introduction to Probability

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Sampling and Sampling Distributions

Interval Estimation

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Comparisons Involving Proportions and a Test of Independence

Simple Linear Regression

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Exam 10: Comparisons Involving Means, Experimental Design and Analysis of Variance

If we are interested in testing whether the mean of items in population 1 is significantly smaller than the mean of items in population 2, the

The test scores for selected samples of sociology students who took the course from three different instructors are shown below. At α\alphaα = 0.05, test to see if there is a significant difference among the averages of the three groups. Use both the critical value and p-value approaches.

The following shows the monthly sales in units of six salespersons before and after a bonus plan was introduced. At 95% confidence, determine whether the bonus plan has increased sales significantly. (For the following matched samples, let the difference "d" be: d = after - before.)

Independent random samples of managers' yearly salaries (in $1000) taken from governmental and private organizations provided the following information. At 95% confidence, test to determine if there is a significant difference between the average salaries of the managers in the two sectors.

Independent simple random samples are taken to test the difference between the means of two populations whose variances are not known, but are assumed to be equal. The sample sizes are n1 = 32 and n2 = 40. The correct distribution to use is the

Exhibit 10-2 The following information was obtained from matched samples. The daily production rates for a sample of workers before and after a training program are shown below. -Refer to Exhibit 10-2. The null hypothesis to be tested is H0: μ\muμ d = 0. The test statistic is

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Comparisons Involving Proportions and a Test of Independence

Simple Linear Regression

Multiple Regression

Filters

Independent simple random samples are taken to test the difference between the means of two populations whose variances are not known, but are assumed to be equal. The sample sizes are n₁ = 32 and n₂ = 40. The correct distribution to use is the