Answer Happy

A study of the ability of individuals to walk in a straight line reported that for a sample of n = 20 randomly selected healthy men, the sample mean cadence was 0.9255 and the sample standard deviation was 0.0809. Calculate and interpet a 95% prediction interval for the cadence of a single individual randomly selelcted from this population.
Which of the following exam scores is better relative to other students enrolled in the course? A psychology exam grade of 87; the mean grade for the psychology exam is 92 with a standard deviation of 3.0 An economics exam grade of 67; the mean grade for the economics exam is 79 with a standard deviation of 8.0 A chemistry exam grade of 54; the mean grade for the chemistry exam is 62 with a standard deviation of 5.0
Consider a normal population distribution with the value of o known. What is the confidence level for the interval 2.81 ? 1 hon?