PROBLEM 9E

During the Friday night shift, n = 28 mints were selected at random from a production line and weighed. They had an average weight of grams and a standard deviation of s = 0.31 grams. Give the lower endpoint of a 90% one-sided confidence interval for μ, the mean weight of all the mints.

Statistics: Chapter 3.1 1. Mean: average of a set of numbers a. (sum of all data values) / (number of values) b. Mean = (Σx) / (n) i. Let x be a quantitative variable with n measured data value from a population of n. c. Example: i. 10, 15, 20, 25….625 ii. (n+1) / 2 iii. “n” : position of the middle number (n odd) between the position of the two middle numbers ( n even ) iv. Mean: 1. Sample Mean = x = Σx / n (statistic) 2. Population Mean = μ = Σx / n (parameter) 2. Median: Middle data value (the central value of an order distribution) a. Med