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

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.

1. 3

2. 4

3. 1

hope this ! have a great day.

-wfz

its totaly b

your welcome btw