1.A 98% confidence interval for the mean of a population where the sample of 42 students had a mean of 30 and a standard deviation of 18? 2.A 98% confidence interval for a mean of a population where the sample of 42 students had a mean of 30. It is known that the standard deviation of all students is 18? 3.A 98% confidence interval for the data: 25, 38, 62, 45, 61, 38, 21, 42, 31, 35? 4 .A 92% confidence interval for the mean height of people in a certain town. It is known that the standard deviation for the height of people from that area is 5 inches. 82 people were measured and the mean height was 68 inches? 5. A 92% confidence interval for the mean height of people in a certain town. 82 people were measured and the mean height was 68 inches with a standard deviation of 5 inches?