A random sample of size 21 was taken from a normal population. The sample average was 9.87 and the sample SD was 1.17. What test should you use for testing whether the population mean equals 9.7?

Question

Question 4 options:

1)

One sample z-test for the population mean.

2)

two sample z-test for the population means.

3)

One sample z-test for proportions.

4)

two sample z-test for proportions.

5)

one sample t-test for the population mean.

6)

None of our hypothesis tests fit.

Answer 1

1) One sample z-test for the population mean.

In this case, we are given a random sample from a normal population and we want to test whether the population mean equals a specific value (9.7). Therefore, the appropriate test to use is a one sample z-test for the population mean.