Question 19 Data Set 0-4 A random sample of 64 students produced the following statistics: [ = 18.00, ; = 7.00. For Data Set 8-4 the probability of obtaining such a sample mean (or one smaller) from a population with a mean of 20 and a standard deviation of & is O a. none of the other alternatives are correct answer is O b. ,4013 O c .0987 O d.4772 Question 20 Data Set 8-1 A sample with scores: 1, 2, 3 Refer only to Data Set 8-1. The 95 percent confidence interval about the population mean is O a. - 43 to 3.43 O b. 1.20 to 2.80 O c. -2.30 to 6.30 O d. none of the other alternatives are correct; answer is