Suppose simple random samples of size 75 were selected from a population with a mean of 56 and a variance of 12. What are the mean and standard deviation of the sampling distribution of the sample mean?
a.
and
b.
and
c.
and
d.
and
Question 2 When is the following
z-score formula used,
?
a.It gives the
z-score when dealing with a sample mean.
b.It gives the
z-score when dealing with individual values from a normal distribution.
c.It gives the
z-score when the sample mean is equal to the population mean.
d.It gives the
z-score when the standard error of the mean is equal to the population variance.
Gas molecules have no bonds to other molecules and move in random motion.
Population and Settlement
Population and Settlement
Vapor Densities of Selected Chemicals
Working-Age Fraction of the U.S. Population, 1950–2050
(a) Graph for converting values to p values. (b) Table of values for selected values of df