Quiz 8 - MGMT 650 9047 Statistics for Managerial Decision Making (2235) - UMGC Learning Management S

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Apr 3, 2024

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Quiz 8 Shaun Wright (username: SWRIGHT112) Attempt 1 Written: Jul 11, 2023 10:26 PM - Jul 11, 2023 10:46 PM Submission View Released: Jul 11, 2023 11:59 PM Question 1 8 / 8 points The director for Weight Watchers International wants to determine if the changes in their program results in better weight loss. She selected 25 Weight Watcher members at random and compared their weight 6 months later to weight at the start of the program. The results are in this excel file: Weight Watchers.xlsx (The weight in the column labeled “After” represents their weights six months later and “Before” represents their weight at the start of the six-month period.) The director used .05 as the significance level. Use Excel to test. For each paired difference, compute After – Before. In Data Analysis, t-Test: Paired Two Sample for means, select the After data for Variable 1 Range. Note that the critical value output by Data Analysis for this test is always positive. In this problem, the sign of the critical value is negative corresponding to a 1-tailed test with lower reject region and negative lower critical value. What are the Null and Alternate Hypotheses? (Keep the Excel file open for the next parts of the question.)

Question 2 0 / 8 points Refer to the Weight Watchers file here: Weight Watchers.xlsx Use Excel to test. For each paired difference, compute After – Before. In Data Analysis, t-Test: Paired Two Sample for means, select the After data for Variable 1 Range. Note that the critical value output by Data Analysis for this test is always positive. In this problem, the sign of the critical value is negative corresponding to a 1-tailed test with lower reject region and negative lower critical value. What is the t-statistic (t-score)? Question 3 8 / 8 points Refer to the Weight Watchers file here: Weight Watchers.xlsx Use Excel to test. For each paired difference, compute After – Before. In Data Analysis, t-Test: Paired Two Sample for means, select the After data for Variable 1 Range. Note that the critical value output by Data Analysis for this test is always positive. In this problem, the sign of the critical value is negative corresponding to a 1-tailed test with lower reject region and negative lower critical value. H0: After – Before > 0; HA: After – Before ≤ 0 H0: After – Before ≥ 0; HA: After – Before < 0 H0: After – Before ≥ 0; HA: After – Before > 0 H0: After – Before = 0; HA: After – Before ≠ 0 7.087 9.321 -7.087 -9.321

What is the critical t-value? Question 4 8 / 8 points Refer to the Weight Watchers file here: Weight Watchers.xlsx Use Excel to test. For each paired difference, compute After – Before. In Data Analysis, t-Test: Paired Two Sample for means, select the After data for Variable 1 Range. Note that the critical value output by Data Analysis for this test is always positive. In this problem, the sign of the critical value is negative corresponding to a 1-tailed test with lower reject region and negative lower critical value. What is your conclusion? Question 5 8 / 8 points A new drug is created to help people with depression. When testing the drug, what are the null and alternative hypotheses? 1.711 or -1.711 7.861 or -7.861 5.614 or -5.614 3.645 or -3.645 Do not reject the NULL Hypothesis because the actual value is greater than critical value Do not reject the NULL Hypothesis because the actual value is less than the critical value Reject the NULL Hypothesis because the actual value is greater than critical value Reject the NULL Hypothesis because the actual value is less than the critical value

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