9) A group of eight individuals with high cholesterol levels were given a new drug that was designed to lower cholesterol levels. Cholesterol levels, in milligrams per deciliter, were measured before and after treatment for each individual, with the following results: Individual Before After 216 210 170 1 277 287 3 270 4 273 200 235 173 6. 255 213 7 299 185 8. 277 188 (a) Construct a 99.5% confidence interval for the mean reduction in cholesterol level. Let d represent the difference in cholesterol level before and after treatment. (b) A physician claims that the mean reduction in cholesterol level is more than 80 milligrams per deciliter. Does the confidence interval contradict this claim?

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9) A group of eight individuals with high cholesterol levels were given a new drug that was designed to
lower cholesterol levels. Cholesterol levels, in milligrams per deciliter, were measured before and after
treatment for each individual, with the following results:
Individual
Before
After
216
210
170
1
277
287
3
270
4
273
200
235
173
6.
255
213
7
299
185
8.
277
188
(a) Construct a 99.5% confidence interval for the mean reduction in cholesterol level. Let d
represent the difference in cholesterol level before and after treatment.
(b) A physician claims that the mean reduction in cholesterol level is more than 80 milligrams
per deciliter. Does the confidence interval contradict this claim?
Transcribed Image Text:9) A group of eight individuals with high cholesterol levels were given a new drug that was designed to lower cholesterol levels. Cholesterol levels, in milligrams per deciliter, were measured before and after treatment for each individual, with the following results: Individual Before After 216 210 170 1 277 287 3 270 4 273 200 235 173 6. 255 213 7 299 185 8. 277 188 (a) Construct a 99.5% confidence interval for the mean reduction in cholesterol level. Let d represent the difference in cholesterol level before and after treatment. (b) A physician claims that the mean reduction in cholesterol level is more than 80 milligrams per deciliter. Does the confidence interval contradict this claim?
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