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. Question 13 0/1 pt 3 Part 1 of 3 How much more likely are alcoholics to say sober for a year after counseling if their best friend is not an alcoholic vs. if their best friend is an alcoholic? A researcher tracked 703 alcoholics whose best friends were not alcoholics and 614 alcoholics whose best friends were alcoholics. A year later 552 of those whose best friends were not alcoholics stayed sober for the year and 304 of those whose best friends were alcoholics stayed sober for the year. For this study, we should use o t-interval for the difference between two independent population means t-interval for a population mean Z-interval for the difference between two population proportions t-interval for the difference between two dependent population means Z-interval for a population proportion. Question 14 0.25/1 pt 0 0-3 - 99 Score on last try: 0.25 of 1 pts. See Details for more. > Next question Get a similar question You can retry this question below Part 1 of 3 What is the average increase in stock prices after a positive earnings report? A researcher randomly selected ten stocks that recently reported positive earnings. The before and after prices for each of these stocks are shown below. Stock Prices Before and After a Positive Earnings Report Before 25.24 36.82 30.34 37.62 33.33 28.33 43.92 32.57 47.39 45.51 After 35.06 40.46 31.28 42.27 52.91 29.82 47.23 50.11 54.47 49.47 Assume both follow a Normal distribution. For this study, we should use t-interval for the difference between two dependent population means Part 2 of 3 Compute the 99% confidence interval for the difference. Round to the nearest minute.Score on last try: [L15 of 1 pts. See Details for more. 3 Get a similar question "fbu can retry this question below Part 1 of 3 How much more should you expect to pay for a gallon of organic milk compared to what you would pay for regular milk? a researcher looked at the prices of organic milk at several markets and regular milk at seyeral markets throughout the year. The data below shows the results. rganic: 5.25, 6.445, 4.13, 5.6:1, 4.16, 5.13, 6.16, 6.91, 4.50, 5.33, 6.61, 5.5[2' Regular: 3.46:, 3.34, 1.34, 3.31, 3.10, 3.11,1.91, 3.36, 3.41, 1.51 Assume both follow a Normal distribution. For this stud we should use t-interyl for the difference between two independent population means : 2' c1" Part10f3 Compute the 99% confidence interval for the difference. and to the nearest penny. 1:: :13