A Coach Uses a New Technique in Training Middle Distance

question 31

Multiple Choice

A coach uses a new technique in training middle distance runners.The times for 9 different athletes to run 800 metres before and after this training are shown below.
Construct a 99% confidence interval for the mean difference of the "before" minus "after" times if
(before - after) = 1.222 and
= 1.826

• A)(-0.54,2.98)
• B)(-6.42,8.87)
• C)(-0.85,3.29)
• D)(-0.76,3.20)
• E)(-0.82,3.26)

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