Practice Problems 1. Eight hundred students at Westfield High School were asked if they wanted
to hold their spring prom at the local Lantana Ballroom. Four hundred-fifty of
them answered "NO"! Construct the 99% confidence interval for the true pro-
portion of all Westfield HS students who do not want the prom there.

Of the following, which statement or statements accurately reflect a way in which credit can be safer than cash? i. if your credit card gets stolen, you can cancel it and get your money back. ii. it is harder to lose a single credit card than a large number of bills. iii. if a merchant does not honor the agreement, you can call the credit company and dispute the charges. a. i and iii b. ii only c. iii only d. i, ii, and iii