In 1998, as an advertising campaign, the Nabisco Company announced a “1000 Chips
Challenge,” claiming that every 18-ounce bag of their Chips Ahoy! cookies contained at
least 1000 chocolate chips. Dedicated statistics students at the Air Force Academy (no
kidding) purchased some randomly selected bags of cookies and counted the chocolate
chips. Some of their data are given below.
1219 1214 1087 1200 1419 1121 1325 1345
1244 1258 1356 1132 1191 1270 1295 1135
(a) Check the assumptions and conditions for inference. Comment on any concerns you
have.
(b) Create a 90% confidence interval for the average number of chips in bags of Chips
Ahoy! cookies.
(c) What does this confidence interval say about Nabisco’s claim?