The Vilmore Corporation is considering two word-processing programs for its PCs. One factor that will influence its decision is the ease of use in preparing a business report. Consequently, Jody Vilmore selected a random sample of nine typists from the clerical pool and asked them to type a typical report using both word processors. The typists then were timed (in seconds) to determine how quickly they could type one of the frequently used forms. The results were as follows.

Jody wishes to have an estimate of the smallest and biggest differences that might exist in the average time required for typing the business form using the two programs. Provide this information.

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