Researchers have postulated that because of differences in d

Researchers have postulated that because of differences in diet, Japanese children have a lower mean blood cholesterol level than U.S. children do. Suppose that the mean level for U.S. children is known to be 160. Let represent the true mean blood cholesterol level for Japanese children. What hypotheses should the researchers test?

H₀: = 160 versus H_a: < 160

H₀: = 160 versus H_a: > 150    

H₀: = 160 versus H_a: > 160

H₀: = 160 versus H_a: < 170

H₀: = 170 versus H_a: > 160

Solution

H0: = 160 versus Ha: < 160