9. 10. 11. 12. A survey using a random sample of 200 students in a region shows that 38 live in apartments. Find an approximate 92% condence interval for the proportion of all people in the region who live in apartments. The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A sample of 20 chickens shows they laid an average of 20 eggs per month with a standard deviation of 2 eggs per month. Develop the 95 percent condence interval for the population mean. Would it be reasonable to conclude that the population mean is 20 eggs? What about 25 eggs? A recent study by the American Automobile Dealers Association revealed the mean amount of prot per car sold for a sample of 20 dealers was 290, with a standard deviation of 125. Develop a 95 percent condence interval for the population mean Schlumberger and Shell are two large employers in oil and gas, Malaysia. They are considering jointly oermg child care for their employees. As a part of the feasibility study, they wish to estimate the mean weekly child-care cost of their employees. A sample of 10 employees who use child care reveals the following amounts spent last week. 10? 92 97" 95 105 101 91 99 95 104 Develop a 90 percent condence interval for the population mean