1. Sterol Lévels A medical researcher to see if he can lower the cholesterol levels through diet in 6 people by showing a film about the effects of high cholesterol levels. The data are shown. At a = 0.05, did the cholesterol level decrease on average? Patient 2. 216 5. 9. 3. 4. Before 243 214 222 219 After 215 202 198 195 204 213 6. PGA Golf Scores At a recent PGA tournament (the Honda Classic at Palm Beach Gardens, Florida) the following scores were posted for eight randomly selected golfers for two consecutive days. At a = 0.05, is there evidence of a difference in mean scores for the %3D two days? 1 2 3. 68 5 6 7 8 4. 89 68 70 71 72 69 Golfer 69 70 70 Thursday 67 65 70 Friday 68 70 69 Source: Washington Observer-Reporter. 7. Reducing Errors in Grammar A composition teacher wishes to see whether a new smartphone app will re- duce the number of grammatical errors her students make when writing a two-page essay. She randomly se- lects six students, and the data are shown. At a = 0.025. can it he concluded that the number of errors has been

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