The Essentials of Statistics 3rd Edition by Joseph Healey

Exercise 1

For each of the following, test for the significance of the difference in sample statistics by using the five-step model. (Hint: Remember to solve Formula 8.4 before attempting to solve Formula 8.2. Also, in Formula 8.4, perform the mathematical operations in the proper sequence. First, square each sample standard deviation, divide by the proper N - 1, add the resultant values, and then find the square root of the sum.)