It makes a difference whether or not we know the population variance because
a. we cannot deal with situations in which the population variance is not known.
b. we have to call the result t if the population variance is used.
c. we have to call the result z if the population variance is not used.
d. we have to call the result t if the sample variance is used.
Question 2
If the population from which we draw samples is rectangular, then the sampling distribution of the mean will be
a. rectangular.
b. normal.
c. bimodal.
d. more normal than the population.
Natural selection of a population for dark coloration.
Giraffe extending its tongue to feed. Its tongue, lips and palate are tough enough to deal with shar
Male Turkmen in the wealthier half of the population had higher fertility rates than those in the po
Difference between chromosomes, chromatids, and chromatins
The Inverted Income Pyramid: The Proportion of Income Received by Each Fifth of the U.S. Population
Population Indicators