Spirit airlines competes as an ultra-low-cost carrier (ulcc), and does so by "unbundling" extra services from its basic fare. as a result, things that other airlines include in their prices (for example, carry-on bags) cost extra on a spirit flight. this approach allows spirit airlines to keep prices low, attracting a different type of customer who values price above comfort and amenities.

Which is cheaper: eating out or dining in? the mean cost of a flank steak, broccoli, and rice bought at the grocery store is $13.04 (money. msn website, november 7, 2012). a sample of 100 neighborhood restaurants showed a mean price of $12.75 and a standard deviation of $2 for a comparable restaurant meal. a. develop appropriate hypotheses for a test to determine whether the sample data support the conclusion that the mean cost of a restaurant meal is less than fixing a comparable meal at home. b. using the sample from the 100 restaurants, what is the p-value? c. at a = .05, what is your conclusion? d. repeat the preceding hypothesis test using the critical value approach