Researchers randomly divided 500 volunteers into two equal-sized groups. One gro

Question

Researchers randomly divided 500 volunteers into two equal-sized groups. One group spent 6 months on the Paleo diet. A control group received a pamphlet about controlling portion sizes. During the study, the Paleo group lost on average 7 pounds (standard deviation of 20 pounds) while the control group had lost on average 5 pounds (standard deviation of 12 pounds). Calculate the p-value assessing if the Paleo diet provides more weight control than the control treatment.

Select one:

a. 0.176

b. 0.088

c. Not enough information

d. 0.05

Explanation / Answer

THe p-value through a two-means test with

Mean1= 7 and standard deviation1 = 20

and Mean2=5 and standard deviation2=12

with n1=n2=250 is

0.176 from the formula.

p -value for t=-1.356 and 498 degrees of freedom is 0.176

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