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Minitab v13 -
Hypothesis Testing: Continuous Variables (1 Sample)

The two sets of data are given the names Words and IQ. The Minitab Project is available.

Z test

Use the "1-Sample Z..." command off of the "Stat, Basic Statistics" menu. That is:

That will take you to the following dialog box:

Type Words in the "Variables:" box (or double click it from the left hand menu). Then type in the "Sigma:" and the mew ("Test mean:"). If you click on the "Options..." button and then the "Graphs..." button, you will see the following dialog boxes:

This is at it should be, that is, alpha set to .05 with a nondirectional test.

Check the "Histogram of data" box. Choose the "OK" button twice. The output will look like this:

One-Sample Z: Words

Test of mu = 7 vs mu not = 7
The assumed sigma = 2

Variable   N    Mean   StDev   SE Mean
Words     20   8.350   0.988    0.447

Variable      95.0% CI       Z     P
Words     ( 7.473, 9.227) 3.02 0.003

And the graph:

t test

Use the "1-Sample t..." command off of the "Stat, Basic Statistics" menu. That is:

That will take you to the following dialog box:

Type IQ in the "Variables:" box (or double click them from the left hand menu). Then type in the mew ("Test mean:"). If you click on the "Options..." button and then the "Graphs..." button, you will see the following dialog boxes:

This is at it should be, that is, alpha set to .05 with a nondirectional test.

Check the "Histogram of data" box. Choose the "OK" button twice. The output will look like this:

One-Sample T: IQ

Test of mu = 102 vs mu not = 102

Variable     N    Mean  StDev  SE Mean
IQ          20  110.50  13.12    2.93

Variable        95.0% CI        T     P
IQ         ( 104.36, 116.64) 2.90 0.009

And the graph:


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