Question 4 of 15 This test: 41 point(s) possible This question: 1 point(s) possible Submit test Assume that you have a sample of n, = 8, with the sample mean X, = 42, and a sample standard deviation of S, = 4, and you have an independent sample of n2 = 15 from another population with a sample mean of X2 = 34 and a sample standard deviation of S2 = 5. What assumptions about the two populations are necessary in order to perform the pooled-variance t test for the hypothesis Ho: H1 = H2 against the alternative H1: H1 > H2 and make a statistical decision? Choose the correct answer below. O A. It is necessary to assume that the populations from which you are sampling have independent normal distributions and equal variances. O B. It is necessary to assume that the populations from which you are sampling have unequal variances and equal sizes. O C. It is necessary to assume that the populations from which you are sampling have equal population means and positive standard deviations. O D. It is necessary to assume that the populations from which you are sampling have negative tSTAT test statistics and unequal sample means. Time Remaining: 02:56:10 NextQuestion 5 of 15 This test: 41 point(s) possible This question: 1 point(s) possible Submit test K The histogram and cumulative percentage polygon below visualize the property taxes per capita for 67 locations. What conclusions can you reach concerning the property taxes per capita? Histogram for property taxes per capita ($) Cumulative percentage polygon for property taxes per capita ($) 24- 100% 20- 80% 12 60% Frequenc 40% 20% 200 400 600 800 200 400 600 800 Which of these conclusions can you reach concerning the taxes per capita? A. Approximately 46% of the data fall below $250. The center is at about $500. O B. Approximately 40% of the data fall below $250. The center is at about $400. O C. Approximately 10% of the data fall below $350. The center is at about $500. O D. Approximately 10% of the data fall below $150. The center is at about $400. Time Remaining: 02:56:00 Next00 (31452) Final Exam Question 8 of 15 This test: 41 point(s) possible This question: 1 point(s) possible Submit test The increase or decrease in the price of a stock between the beginning and the end of a trading day is assumed to be an equally likely random event. What is the probability that a stock will show a decrease in its closing price on nine consecutive days? The probability that a stock will show a decrease in its closing price on nine consecutive days is. (Round to four decimal places as needed.) Time Remaining: 02:55:41 NextDebora Pierre 12/15/22 10:35 AM 0 (31452) Final Exam Question 11 of 15 This test: 41 point(s) possible This question: 1 point(s) possible Submit test If you want to be 99% confident of estimating the population mean to within a sampling error of 16 and the standard deviation is assumed to be 12, what sample size is required? CID The sample size required is]. (Round up to the nearest integer.) Time Remaining: 02:54:51 Next