34. What should I buy? A study conducted by the Pew Research Center reported that 58% of cell phone owners used their phones inside a store for guidance on purchasing decisions. A sample of 15 cell phone owners is studied. b. What is the probability that fewer than 10 of them used their phones for guidance on purchasing decisions

B. Using data from the 2016 General Social Survey, you wish to understand whether men and women are equally likely to believe that grown children should move back with their parents. The below table shows the crosstab of these two variables using column percentages, with further statistical information reported below. Should grown children move back with parents A good idea A bad idea It depends Total Respondents sex Male 85 39.35 90 41.67 41 18.98 216 100.00 Pearson's chi2(2) = 10.7158 Pr = 0.005 Cramer's V = 0.1548 Female 1.07 46.32 63 27.27 61 26.41 231 100.00 Total 192 42.95 153 34.23 102 22.82 447 100.00

Four scenarios of statistical studies are given below. Decide which study uses a population parameter. Answer O Lakeside Family Dentistry reported that 6 of the 15 patients who came in for a regular cleaning one day had at least one cavity. O As part of her senior project, Kaisa asked 84 of her classmates if they voted in the last presidential election. 39 said yes. O of 351 dog owners who were surveyed, 70 reported owning two dogs. The average finish time for the Ironman, Kona was 11:32 for the 1883 finishers, with an average swim time of 1:14, an average bike time time of 4:14.

Dr. Summit wants to compare the ability to recall events between older adults and younger adults. What is the appropriate test statistic for each scenario? a. One sample Z-test b. One sample t-test c. two related samples t-test d. two independent samples t-test