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Kirkwood Community College *

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AP

Subject

Statistics

Date

Apr 28, 2024

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1

Uploaded by ProfessorBuffaloMaster745 on coursehero.com

@ Exam 2: Chapters 5-7 - Personal - Microsoft Edge s (] X () https://mylab.pearson.com/Student/PlayerTest.aspx?TestResultld=1057569681&review=yes&questionld=13 A -' 04/15/246:03PM (%) Review Test Exam 2: Chapters57 < Question25,7579 > lestScore:82.13% 28750f35paints @ close Statistics 2024SP ATW350 @ Points: 1.76 of 2 A double-blind study using random assignment was done of pregnant women in a certain country. Women were given fish oil or a placebo during pregnancy. Their children were followed during the first 5 years of Question list life to see if they developed asthma. The results are summarized in the accompanying table. Complete parts (a) through (c) below. N Developed asthma Fish Oil Placebo Yes 40 62 % Question 18 No 397 377 %, Question 19 ) ) ; ) a. Calculate and compare the percentages of children who developed asthma in the fish oil group and in the placebo group. - The percentage that developed asthma in the treatment group, 9.2 %, is less than the percentage that developed asthma in the placebo group, 1441‘%, so children whose mother's received the ° Question 20 fish oil during pregnancy did better. The difference in percentages (treatment minus placebo) is - 5.0%. (Round to one decimal place as needed.) @ b. Check that the conditions for using a two-population confidence interval hold. You answered: 4.8 % Question 21 n Correct answers: -5.0 The Random and Independent condition holds. 49 The Large Samples condition holds. @ Question 22 The Big Populations condition can reasonably be assumed to hold. The Independent Samples condition holds. %, Question 23 c. Find the 95% confidence interval for the difference in the proportion of children who develop asthma in the two groups. Based on your confidence interval, can we conclude that there is a difference in the population proportions? The 95% confidence interval for the difference (treatment minus placebo) is ( —.092 , —.007 ). 0 Question 24 (Round to three decimal places as needed.) | am 95% confident that the difference in population proportions is between the lower and upper boundaries of the confidence interval. The interval does not capture 0, suggesting that it x// Question 25 is not plausible that the proportions are the same. Since the boundary values are both negative, we can conclude that a lesser proportion of children whose mothers took fish oil during pregnancy + developed asthma. M 5:54 PM 1 o @ & @ 79°F Sunny D & G sl e N
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