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.
Difference between Asian (left) and African (right) elephant ears.
Who Makes The Decisions at Home?
Limiting factors restrain population growth
Human population growth, 1700 - present
The population of a city has continued to grow since 1950.
Sources of phenotypic variance