9.2.2 As the United States has struggled with the growing obesity of its citizens, diets have become big business. Among the many competing regimens for those seeking weight reductions are the Atkins and Zone diets. In a comparison of these two diets for one-year weight loss, a study (64) found that seventy-seven subjects on the Atkins diet had an average weight loss of T = -4.7 kg and a sample standard deviation of sx = Similar figures for the seventy-nine people on the Zone diet were j = -1.6 kg and sy kg. Is the greater reduction with the Atkins diet statistically significant? Test for a = 0.05. 7.05 kg. 5.36

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I don't need help with the details of solving the attached problem, but rather I don't understand what the alternative hypothesis should be.  I thought it would be muX-muY>0, but other resources I've looked at have it as muX-muY<0.  Why is it the <0 situation and not the >0?

9.2.2 As the United States has struggled with the growing obesity of its citizens, diets have
become big business. Among the many competing regimens for those seeking weight
reductions are the Atkins and Zone diets. In a comparison of these two diets for one-year
weight loss, a study (64) found that seventy-seven subjects on the Atkins diet had an
average weight loss of T = -4.7 kg and a sample standard deviation of sx =
Similar figures for the seventy-nine people on the Zone diet were j = -1.6 kg and sy
kg. Is the greater reduction with the Atkins diet statistically significant? Test for a = 0.05.
7.05 kg.
5.36
Transcribed Image Text:9.2.2 As the United States has struggled with the growing obesity of its citizens, diets have become big business. Among the many competing regimens for those seeking weight reductions are the Atkins and Zone diets. In a comparison of these two diets for one-year weight loss, a study (64) found that seventy-seven subjects on the Atkins diet had an average weight loss of T = -4.7 kg and a sample standard deviation of sx = Similar figures for the seventy-nine people on the Zone diet were j = -1.6 kg and sy kg. Is the greater reduction with the Atkins diet statistically significant? Test for a = 0.05. 7.05 kg. 5.36
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