SOLUTION: 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 d

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Question 1179667: 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 cholesrweol readings of the 11 employees both before the new diet and one month after the use of the diet began. Construct a 98% confident interval to estimate the population mean difference of cholesterol readings for people who are involved in this programme. Assume differences in cholesterol readings are normally distributed in the population.

Employee_ID Before After
1 255 197
2 230 225
3 290 215
4 242 215
5 300 240
6 250 235
7 215 190
8 230 240
9 225 200
10 219 203
11 236 223
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
Before: m1 = 244.7 and sd = 26.4
After:  m2 =216.6 and sd = 16.8
Ho:  m1 = m2 
Ha   m1 ≠ m2 
  Critical Value: two-tailed  |t-value| > t(.98, df = 22-2) = 2.53 reject Ho
+t+=%28216.6-244.7%29%2Fsqrt%28697%2F11%2B+282%2F11%29+ = -2.9786
p-value = .0048
|-2.9786| > 2.53 Reject Ho. 
Sufficient evidence to show that the Diet made a difference.

Wish You the Best in your Studies.