In many manufacturing processes, the term work-in-process (often abbreviated WIP) is used. At the LSS Publishing book manufacturing plants, WIP represents the time it takes for sheets from a press to be folded, gathered, sewn, tipped on end sheets, and bound together to form a book, and the book placed in a packing carton.

The operational definition of the variable of interest, processing time, is the number of days (measured in hundredths) from when the sheets come off the press to when the book is placed in a packing carton. The company has the business objective of determining whether there are differences in the WIP between plants. Data have been collected from samples of 20 books at each of two production plants. The data, stored in WIP , are as follows:

Completely analyze the data.

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Plant A 5.62 5.29 16.25 10.92 11.46 21.62 8.45 8.58 5.41 11.42 11.62 7.29 7.50 7.96 4.42 10.50 7.58 9.29 7.54 8.92 Plant B 9.54 11.46 16.62 12.62 25.75 15.41 14.29 13.13 13.71 10.04 5.75 12.46 9.17 13.21 6.00 2.33 14.25 5.37 6.25 9.71