This is a simple calculator for conducting a hypothesis test for a single-sample z-test, sigma known.

Important Note: BUS 233 Requirements for using the z-distribution:

- The population standard deviation is known.
- The sample size is greater than or equal to (>=) 30.

If either 1 or 2 is true for your problem, use the z-test. If neither is true, use the t-test [here].

Note: for large samples, if you do not know the population standard deviation, sigma, use the sample standard deviation, s, in the calculator below.

Enter your data in the blue cells. Then, select the math operator in the Alternative Hypothesis (which tails you the tail of the test) in the orange drop down box. All the yellow answer cells will be updated accordingly.

Hope this helps.

Dr. Dawn

V1.04 4-2-2018