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 165. let μ represent the true mean blood cholesterol level for japanese children. what hypotheses should the researchers test?

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H₀: µ = 170 (the null hypothesis is the hypothesis to be tested)

H₁: µ < 170

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the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.