Section 6.1 1. When estimating a population parameter from sample statistics, rather than estimating a specic value, what is used? 2. lfp = 12.74 and E = 10.87. What is the sampling error? 3. Let c = 0.90, a = 9.6, and n = 34. What is the margin of error, E? Problems 4-5. Use the condence interval for the population mean, (54.32, 72.18), to answer the questions. 4. What is the margin of error, E? 5. What is the sample mean, 5? 6. Minimum sample size. Let c = 0.95, a = 10.4, and E = 2.1. What is the minimum sample size, n, needed to estimate u? (see FAQ chapter 4.) 7. Repair Costs: Refrigerators. In a random sample of 50 refrigerators, the mean repair cost was $194.00. The population standard deviation, 0 = $22.50. Construct a 90% condence interval for the population mean repair cost. Section 6.2 Problems 8-10. Assume that a is not known, the sample is random, and the population is normally distributed. 8. Let c = 0.99 and n = 33. Find the critical value, ta. 9. Let c = 0.95, s = 6.9, and n = 40. Find the margin of error, E. 10. Let c = 0.98, 5 = 53.7, s = 6.4, and n = 32. Construct a condence interval for the population mean u using the t-distribution