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.
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