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 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. 4. 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.

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