A community paper in the Spanish language was delivered to many sites in the San Francisco Bay area. As a check on the circulation numbers that are important to advertisers, a survey was conducted at four drop sites. The number of papers delivered to each site and the number remaining after 3 days was recorded.

(a) Formulate a null hypothesis of no difference in the proportions of papers taken from the sites.
(b) Conduct a x2 test of your null hypothesis. Use α = .05.

(c) Let p1, p2 , P3 , and p4 denote the probabilities that a paper will be taken from drop sites 1, 2, 3, and 4, respectively. Construct the four individual 95% confidence intervals and plot these intervals.

Transcribed Image Text:

Papers Delivered Papers Remaining Site I Site 2 Site 3 Site 4 50 47 48 50 17 12 7 21