Statistics 9.2
12. The trade volume of a stock is me number of shares traded on a given day. The data in the first accompanying table. in millions (so that 6.16 represents 6,160,000 shares traded), represent the volume of a PepsiCo stock traded for a random sample of 38 trading days in 2018. A second random sample of 38 days in 2018 resulted in the data in the second accompanying table. Complete parts (a) through (d). Click here to view the data for sample 1.7 Click here to view the data for sample 2.5 Click here to view the table of critical tvalues.9 (a) Use the data from sample 1 to compute a point estimate for the population mean number of shares traded per day in 2018. A point estimate for the population mean number of PepsiCo shares traded per day in 2018 is :I million. (Round to two decimal places as needed.) (b) Using the data from sample 1, construct a 95% condence interval for the population mean number of shares traded per day in 2018. Interpret the condence interval. Select the correct choice below and ll in the answer boxes to complete your choice. (Round to two decimal places as needed.) 0 A- One can be "A. condent that the population mean number of shares of PepsiCo stock traded per day in 2018 is between [g million and million. O B- The number of shares of PepsiCo stock traded per day is between S million and million for |% of all days in 2018. O c- There is a % probability that the population mean number of shares of F'epsiCo stock traded per day in 2018 is between million and million. 0 0- One can be "In condent that the number of shares of PepsiCo stock traded in all days of 2018 is between million and million. (1:) Using the data from sample 2. construct another 95% confidence interval for the population mean number of shares traded per day in 2018. Interpret the condence interval. Select the correct choice below and ll in the answer boxes to complete your choice. (Round to two decimal places as needed.) O A- One can be "A. condent that the number of shares of FepsiCo stock traded in all days of 2018 is between million and million. 0 B- One can be "In condent that the population mean number of shares of PepsiCo stock traded per day in 2018 is between million and million. 0 C. The number of shares of PepsiCo stock traded per day is between million and million for "In of all days in 2018. O 0- There is a % probability that the mean population number of shares of F'epsiCo stock traded per day in 2018 is between million and million. (d) Explain why the condence intervals obtained in pal'ls (b) and (c) are different. Choose the correct answer below. 0 A. They are different because they represent different populations. The populations have different means and standard deviations that lead to different confidence intervals. 0 B. They are different because there is an error in at least one of the samples. If the samples were obtained correctly. then the condence intervals would be the same. 0 C. They are different because of variation in sampling. The samples have different means and standard deviations that lead to different confidence intervals. 0 D. The confidence intervals are not different. 7: Sample 1 Volumes (millions) Sample 1 Q1 6.16 4.1 E 4.96 7.54 5.55 8.38 4.28 6.10 7.28 4.00 6.39 6.22 4.02 4.64 4.35 6.96 5.32 6.71 5.05 2.37 4.95 4.34 4.42 4.13 3.25 6.67 4.92 6.23 4.41 7.71 4.97 7.29 5.07 3.94 4.80 5.04 6.92 2.42 8: Sample 2 Volumes (millions) Sample 2 Q1 6.12 4.89 4.49 10.96 8.57 5.27 3.65 7.65 6.89 4.96 5.73 3.75 6.34 4.54 3.65 4.85 4.80 8.13 5.08 5.75 6.85 5.46 5.90 4.81 4.52 6.69 3.39 7.84 5.00 6.04 5.44 6.58 7.76 6.74 5.98 4.37 5.68 3.71 51- Tnhlc: nf ritir'al LVQII lat
