Question

When comparing a single sample to a population mean, a one sample t test must be used instead of a one sample z test when what value is unknown?

a. The sample mean
b. The population standard deviation
c. The desired alpha level
d. The sample standard deviation
e. The sample variance

Answer 1

Answer: b. The population standard deviation

Step-by-step explanation:

The one-sample z-test is a test that us carried out to ascertain whether the mean of a population is either greater or less than a specific value given.

The one sample t test is used in comparing the mean of the sample data of the researcher carrying out the research to a known value.

When the population standard deviation is known, the one sample z test is used while when the population standard deviation is not known, one can use the one sample t test.