An office manager randomly selects 30 smokers and 35 non-smokers who are on staff. He then records the number of minutes wasted per working hour by each employee in these groups. He wants to know if smokers waste more working time than non-smokers. How should he test this?

a. z-test for a single mean
b. t-test for the difference between two independent means
c. t-test for a single mean
d. z-test for the difference between two independent means
e. t-test for the difference between two dependent means


Ans: b

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