Need explanation, show works

9. Joan has just moved into a new apartment and wants to purchase a new couch. To determine if there is a difference between the average prices of couches at two different stores, she collects the following data. Test the hypothesis that there is no difference in the average price. Use a : 0.10. Store 1 Store 2 2?] = $650 f2 = $680 0'1 : $43 02 : $52 n1 : 42 n2 : 45 A) There is no signicant difference in average price because the test value -2.94 > -3.05. B) There is signicant difference in average price because the test value -2.94 1.65. 10. A sociologist expects the life expectancy of people in Africa is different than the life expectancy of people in Asia. The data obtained is shown in the table below. Determine the 95% condence interval for the difference in the population means. Africa Asia 2?] = 55.3 yr. 32 = 65.2 yr. 01:8.1yr. 02:93 yr. n1 : 53 n2 : 42