According to a poll, of 89 female respondents 8 said that purple is their least favorite color, and of 65 male respondents 15 said that purple is their least favorite color. 95% upper condence bound for the difference in the proportions of females and males who say that purple is their least favorite color (female - male) is O -0.14 + 0.099 O -0.14 + 0.118 O -0.14 + 0.141 O -0.14 + 0.077