15.9 What’s the best way to learn French? Exercise 14.3 gave the data in the table for scores on the first quiz for ninthgrade students in an introductory-level French course. The instructor grouped the students in the course as follows:

Group 1: Never studied foreign language before, but have good English skills Group 2: Never studied foreign language before; have poor English skills Group 3: Studied at least one other foreign language The table also shows results of using MINITAB to perform the Kruskal-Wallis test.

a. Find the rank associated with each observation and show how to find the mean rank for Group 1.

b. Report and interpret the P-value for the test.

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Scores on the quiz Group 1 4 6 8 Group 2 Group 3 1 9 5 10 5