How to perform a Z-Test Step by Step on the TI 89 using Statistics Made Easy

Here is a sample problem:
A student who works in the blood lab plans to test the hypothesis that the mean cholesterol level of men is less than 230 mg/dL. The population variance of cholesterol level is assumed to be (40 mg/dL)^2. The student tested nine men for cholesterol levels
and found the following values (mg/dL): 164, 230, 335, 272, 261, 248, 235, 192, and 203.

Since we are given the variance , we use the Z-Test.
Since we are given the data, we may just enter them in the 2. row using list notation {..} .

Next just press enter to view everything you need: test statistic, p-value, conclusion, even type 2 error and power of test can be found.

Very easy to use, yet very powerful!

SCREEN02

SCREEN02

SCREEN02

SCREEN02

SCREEN02

Leave a Reply