If sleep repairs the wear and tear of the day's activities on the body, then
a. we should all need about the same amount of sleep each night.
b. sedentary people should need more sleep each night than active people.
c. active people should need more sleep each night than sedentary people.
d. persons in dangerous occupations should need more sleep than those in other occupations.
e. males should need more sleep than females.
c. active people should need more sleep each night than sedentary people.
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For testing the null hypothesis that mu is less than or equal to 500, using a normal sampling distribution, the rejection region is in the lower tail of the sampling distribution.
a. true b. false
Techniques which are used for describing small or large amounts of data in
abbreviated form, are called a. descriptive statistics b. inferential statistics c. predictive statistics d. probability estimates