Eleven employees were put under the care of the company nurse because of high cholesterol readings. The nurse lectured them on the dangers of this condition and put them on a new diet. Shown are the cholesterol readings of the 11 employees both before the new diet and one month after the use of the diet began: Construct a 98% confidence interval to estimate the population mean difference of cholesterol readings for people who are involved in this program. Assume differences in cholesterol readings are normally distributed in the population.
Employee Before After
1 255 200
2 234 225
3 290 215
4 242 215
5 292 240
6 250 230
7 215 190
8 234 240
9 225 204
10 219 203
11 239 223
(Round the intermediate values to 3 decimal places, e.g. 1.254. Round your answer to 3 decimal places, e.g. 1.254.)
≤ D ≤