DATA is found in CSV form @ https://drive.google.com/file/d/0B_93dUhBvN30RzUtaE1

Question

DATA is found in CSV form @ https://drive.google.com/file/d/0B_93dUhBvN30RzUtaE1JRGZKbVk/view?usp=sharing

Researchers used 7 red and 7 black playing cards to randomly assign 14 volunteer males with high blood pressure to one of two diets for four weeks: a fish oil diet and a standard oil diet. The reductions in diastolic blood pressure were measured in mm Hg. Do the following steps to compare the treatments. Label the fish oil diet group 1 and the standard oil diet 2. Construct a 95% confidence interval for mu 2 - mu 1 using the function t.test in R. Find the one-sided P-value as evidence that the fish oil diet resulted in greater reduction of blood pressure using the function t.test in R.

Explanation / Answer

Group I - Fish oil diet

Group II - Std oil diet

Confidence interval at 95%

Z value = 1.96

Margin of error = 1.96(0.50365) =0.987153

Confidence interval =

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t value = -15.3168

H0: mu2-mu1 =0

Ha: mu2-mu1 <0

p value for -15.3168 with df = 12

is 0.00001

As p value is less than alpha 0.05, we reject null hypothesis.

Conclusion: Fish oil resulted in greater reduction of blood pressure.

Fish oil 8 12 10 14 2 0.00 0 Regular -6 0 1 2 -3 -4 2

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