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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a. True b. False
The process of supporting a person, group, or cause is called _________
Fill in the blank(s) with the appropriate word(s).
Teachers who assign research activities using on the Web should a. expect their students locate websites from which to gather information. b. evaluate and bookmark the sites for research-gathering to save time. c. remain at their desk and complete personal work while students are completingresearch on the Web
d. have no worries about safe sites as the school filters will take care of all bad sites.
_______________ What is the speed of reading called?
Fill in the blank(s) with correct word