In a particular February, the mean cost for an airline round-trip with a discount fare was $258. A random sample of 15 round-trip discount fares during the month of March provided the following data:
310 260 265 255 300 310 230 250 265 280 290 240 285 250 260
a. Using α = .05, test to see whether the mean round-trip discount fare has increase in March. What is your conclusion?
b. What is the p-value?