The sampling error is

a. The difference between a sample statistic and a population parameter

b. Always positive

c. The difference between the z value and the mean

d. Equal to the population value

The size of the standard error is effected by the standard deviation of the sample and

a. A confidence interval

b. The population parameter

c. The point estimate

d. The sample size. The distribution for testing a hypothesis when the population standard deviation is not known is

a. The t distribution

b. The F distribution

c. The z distribution

d. The distribution