Hypothesis Tests for Means when the mean is known (1-Sample Z Test for a Mean)
- Geogebra Applet for 1-Sample Z Test for a Mean
- First, it is very unusual to know the standard deviation of a population but not it's mean. If you know sigma, then use this test. Otherwise, use T-Test for a Mean (below).
- Select “Z Test of a Mean”
- • Null: put in the hypothesized value for mu.
- • Alternative hypothesis: select <, >, or not equal to.
- • Sample Mean put in the mean that was given to you or calculated for the data and the sample.
- • Sigma: enter the standard deviation for the population.
- • N: Enter the sample size.
- • The P-value is the last number in the report.
- • It also provides the test statistic, Z.