
Concept explainers
(a)
To find: The
(a)

Answer to Problem 42E
Solution: The required
Explanation of Solution
Calculation: Follow the below described steps to compute the F-statistic value using Applet,
Step 1: To compute the F-statistic value select the option ‘Statistical Applets: One-Way Anova’ as shown in the screenshot below,
Step 2: The ANOVA window is displayed in the screenshot below,
Step 3: In the ANOVA window that appears drag the black dots until the p-value at the lower side of the window is set as 0.01. On moving the black dots, the corresponding means, standard deviations,
On a few configurations, the p-value is set at
As is evident from the applet, the
(b)
To find: The changes in
(b)

Answer to Problem 42E
Solution: The
Explanation of Solution
Calculation: Repeat Step 1 of part (a) and on sliding the standard deviations bar to the right, it is observed that there is a gradual drop in the
The corresponding
On sliding the standard deviation bar further to the right side, the following changes can be observed
The
On further adjustments,
Interpretation: The
(c)
To explain: The reason for a change in
(c)

Answer to Problem 42E
Solution: The
Explanation of Solution
An increase in within the group variations leads to a drop in the
Considering the p-value, in case of variations between the groups, the p-value tends to be high accounting for a significant difference between the groups. In case of within variability if the variability is quite large, then p-value does not yield any relevant inference.
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Chapter 12 Solutions
Introduction to the Practice of Statistics
- Please conduct a step by step of these statistical tests on separate sheets of Microsoft Excel. If the calculations in Microsoft Excel are incorrect, the null and alternative hypotheses, as well as the conclusions drawn from them, will be meaningless and will not receive any points 2. Two-Sample T-Test: Compare the average sales revenue of two different regions to determine if there is a significant difference. (Hints: The null can be about maintaining status-quo or no difference among groups; if alternative hypothesis is non-directional use the two-tailed p-value from excel file to make a decision about rejecting or not rejecting null) H0 = H1=arrow_forwardPlease conduct a step by step of these statistical tests on separate sheets of Microsoft Excel. If the calculations in Microsoft Excel are incorrect, the null and alternative hypotheses, as well as the conclusions drawn from them, will be meaningless and will not receive any points 3. Paired T-Test: A company implemented a training program to improve employee performance. To evaluate the effectiveness of the program, the company recorded the test scores of 25 employees before and after the training. Determine if the training program is effective in terms of scores of participants before and after the training. (Hints: The null can be about maintaining status-quo or no difference among groups; if alternative hypothesis is non-directional, use the two-tailed p-value from excel file to make a decision about rejecting or not rejecting the null) H0 = H1= Conclusion:arrow_forwardPlease conduct a step by step of these statistical tests on separate sheets of Microsoft Excel. If the calculations in Microsoft Excel are incorrect, the null and alternative hypotheses, as well as the conclusions drawn from them, will be meaningless and will not receive any points. The data for the following questions is provided in Microsoft Excel file on 4 separate sheets. Please conduct these statistical tests on separate sheets of Microsoft Excel. If the calculations in Microsoft Excel are incorrect, the null and alternative hypotheses, as well as the conclusions drawn from them, will be meaningless and will not receive any points. 1. One Sample T-Test: Determine whether the average satisfaction rating of customers for a product is significantly different from a hypothetical mean of 75. (Hints: The null can be about maintaining status-quo or no difference; If your alternative hypothesis is non-directional (e.g., μ≠75), you should use the two-tailed p-value from excel file to…arrow_forward
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