Test for one proportion

Command

Tests Test for one proportion

Description

The Test for one proportion in the Tests menu can be used to test the hypothesis that an observed proportion is equal to a pre-specified proportion.

This test is not performed on data in the spreadsheet, but on statistics you enter in a dialog box.

Required input

• Observed proportion (%): the observed proportion, expressed as a percentage.
• Sample size: the sample size or total number of observations.
• Null Hypothesis value (%): the pre-specified proportion (the value to compare the observed proportion to), expressed as a percentage.

When all data have been entered click the Test button.

Results

The program displays:

• the 95% Confidence Interval (CI) for the observed proportion
• z statistic and associated P-value.

If the P-value is less than 0.05, the hypothesis that the observed proportion is equal to the pre-specified proportion value is rejected, and the alternative hypothesis that there is a significant difference between the two proportions can be accepted.

In the Comment input field you can enter a comment or conclusion that will be included on the printed report.