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 1 2 3 4 5 6 7 8 277 287 270 273 235 255 299 277 After 216 210 170 200 173 213 185 188 (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
1
2
3
4
5
6
7
8
277
287
270
273
235
255
299
277
After
216
210
170
200
173
213
185
188
NEE
(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.
10
(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 1 2 3 4 5 6 7 8 277 287 270 273 235 255 299 277 After 216 210 170 200 173 213 185 188 NEE (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. 10 (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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