8. Sun or Shade? Researchers examined the differences in a particular plant when grown in full sunlight versus shade conditions.17 In this study, shaded plants received direct sunlight for less than 2 hours each day, whereas full-sun plants were never shaded. A partial summary of the data based on n 516 1 full-sun plants and n 515 2 shade plants is shown here.

a. What assumptions are required in order to use the small-sample procedures given in this chapter to compare full-sun versus shade plants? From the summary presented, do you think that any of these assumptions have been violated?

b. Do the data present sufficient evidence to indicate a difference in mean leaf area for full-sun versus shade plants?

c. Do the data present sufficient evidence to indicate a difference in mean overlap area for full-sun versus shade plants?

Transcribed Image Text:

Full Sun Shade X S X S Leaf Area (cm) 128.00 43.00 78.70 41.70 Overlap Area (cm) 46.80 2.21 8.10 1.26 Leaf Number 9.75 2.27 6.93 1.49 Thickness (mm) .90 .03 .50 .02 Length (cm) 8.70 1.64 8.91 1.23 Width (cm) 5.24 .98 3.41 .61