Question: Refer to the previous exercise. For the control group, the 26 changes in weights have a mean of -0.45. From Example 8 in Chapter 9,

Refer to the previous exercise. For the control group, the 26 changes in weights have a mean of -0.45. From Example 8 in Chapter 9, for the therapy group the sample mean change in weight of 3.0 pounds was significantly different from 0. However, the previous exercise showed it is not significantly different from the mean change for the control group, even though that group had a negative sample mean change. How do you explain this paradox? (From Section 10.2 , how does the se value for estimating a difference between two means compare to these value for estimating a single mean?)

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