Answer Happy

A random sample of 15 graduates of a certain secretarial school typed an average of 78.2 words per minute with a standard deviation of 8.2 words per minute. Assuming a normal distribution for the number of words typed per minute, compute the 99% prediction interval for the next observed number of words per minute typed by a graduate of the secretarial school. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Click here to view page 1 of the table of critical values of the t-distribution. Click here to view page 2 of the table of critical values of the t-distribution. The prediction interval is<x₁ <. (Round to two decimal places as needed.)
The measurements given below were recorded for the drying time, in hours, of a certain brand of latex paint. Assuming that the measurements represent a random sample from a normal population, find a 90% prediction interval for the drying time for the next trial of the paint. Q 3.5 5.2 5.7 4.3 3.7 2.6 2.9 4.9 3.4 3.8 3.5 4.3 The prediction interval is < X <- (Round to two decimal places as needed.) 4.6 2.7 43 Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Click here to view page 1 of the table of critical values of the t-distribution. Click here to view page 2 of the table of critical values of the t-distribution. C