just answer is fine, I am for checking my work.

A simple random sample of 5 observations from a population of 400 elements was taken, and the following values were obtained: 12, 18, 19, 20, 21. A point estimation of the mean is:*

400

18

20

10

The sample error is the*

same as the standard error of the mean

difference between the value of the sample mean and the value of the population mean

error caused by selecting a bad sample

standard deviation multiplied by the sample size

In order to determine an interval for the mean of a population with unknown standard deviation, a sample of 71 items selected. The mean of the sample is determined to be 23. The associated number of degrees of freedom for reading the t value is*

22

23

70

71

A simple random sample of size n from an infinite population of size N is to be selected. Each possible sample should have*

the same probability of being selected

a probability of 1/n of being selected

a probability of 1/N of being selected

a probability of N/n of being selected

The standard deviation of x is referred to as the*

standard mean of x

standard error of the mean

sample standard mean

sample mean deviation