EXAMPLE 8.6

Sunblock significance tests using software. JMP and Minitab outputs for the analysis in Example 8.5 appear in Figure 8.3. First, JMP uses a slightly different way of reporting the results. Two ways of performing the significance test are labeled in the column “Test.” The one that corresponds to the procedure that we have described is on the second line, labeled “Pearson.” The P-value under the heading “Prob>Chisq” is 0.1797, which is very close to the 0.1802 that we calculated using Table A. Minitab reports the value of the test statistic z, and the P-value is rounded to 0.180.