Question 3 1 out of 1 points A medical researcher treats 100 subjects with high

Question

Question 3 1 out of 1 points A medical researcher treats 100 subjects with high cholesterol with a new drug. The average decrease in cholesterol level is 80 units after two months of taking the drug. It has been stated that the decrease in cholesterol after two months of taking the drug follows a normal distribution, with mean m 85 and standard deviation S -20. What is the probability of having the average decrease in 100 subjects be 80 units or less if decrease in cholesterol with his drug has the reported distribution, N(85, 20)'?

Explanation / Answer

t = [ x - ? ] / [ s / sqrt( n ) ]

n = 100

t distribution

t = (80 - 85)/20/?100

t = - 2.5

P = 0.0070

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