1. Construct a confidence interval for p1p2 at the given level of confidence. x1=368, n1=528, x2=444, n2=583, 90% confidence.

The researchers are ___% confident the difference between the two population proportions, p1p2, is between ____ and ____

2. A survey asked, "How many tattoos do you currently have on your body?" Of the 1245 males surveyed, 182 responded that they had at least one tattoo. Of the 1073 females surveyed, 127 responded that they had at least one tattoo. Construct a 99% confidence interval to judge whether the proportion of males that have at least one tattoo differs significantly from the proportion of females that have at least one tattoo. Interpret the interval.

Let p1 represent the proportion of males with tattoos and p2 represent the proportion of females with tattoos. Find the

99% confidence interval for p1p2.

The lower bound is _____

The upper bound is _____