Week 6 Practice Test 2024-02-07 at 12

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American Military University *

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302

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Statistics

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Feb 20, 2024

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@ chatceT [021] Week 6 Knowledge Check Homework Practice Questions Search Results | Course Hero < Back to Content = Week 6 Knowledge Check Homework Practice Questions @ @ Question 12 0/ 1 point A new over-the-counter medicine to treat a sore throat is to be tested for effectiveness. The makers of the medicine take two random samples of 25 individuals showing symptoms of a sore throat. Group 1 receives the new medicine and Group 2 receives a placebo. After a few days on the medicine, each group is interviewed and asked how they would rate their comfort level 1-10 (1 being the most uncomfortable and 10 being no discomfort at all). The results are below. Find the 95% confidence interval in the difference of the mean comfort level. Is there sufficient evidence to conclude that the new medicine is effective? Assume the data is normally distributed with unequal variances. (Round answers to 4 decimal places) Make sure you put the 0 in front of the decimal. Average Group 1 = 5.84, SD Group | =2.211334, nl =25 Average Group 2 = 3.96, SD Group 2 = 2.35372, n2 = 25 aSHEIgS Answer for blank # 1: 0.582 % (0.5813, 0.5812) Answer for blank # 2: 3.178 x (3.1787, 3.1788) w Hide question 12 feedback T-Critical Value =T.INV.2T(.05,48) = 2.010635 LL=(5.84 - 3.96) - 2.010635 * 2.2113342 . 2.353722 25 25 UL =(5.84 - 3.96) + 2.010635 * 2.2113342 " 2.353722 25 25 Question 13 1/ 1 point A pet store owner believes that dog owners spend more on average than cat owners on their pets. The owner randomly records the sales of 40 customers that said they only owned dogs and 40 customers that said they only owned cats. What is the correct decision and summary based on the Excel output below? Assume the populations are approximately normally distributed with unequal variances. = ~ t-Test: Two-Sample Assuming Unequal Variances Dog Cat L = Mean 57.1695|53.8222: |Variance 588.088|573.7205| (Observations 40| 40|
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