18. Red Dye To test the comparative brightness of two red dyes, nine samples of cloth were divided into two pieces. One of the two pieces in each sample was randomly chosen and red dye 1 applied; red dye 2 was applied to the remaining piece. The following data represent a “brightness score” for each piece. Is there sufficient evidence to indicate a difference in mean brightness scores for the two dyes? Use a =.05.

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Sample 1 2 3 4 5 6 7 8 9 Dye 1 10 12 9 8 15 12 9 10 15 Dye 2 8 11 10 6 12 13 9 8 13