Confidence interval for the population variance
Given below are the values taken from a normal population.
21 23 25 27 28 35 30 32 33
Determine a 95% confidence interval for the population variance.
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Perform the four-step hypothesis test to determine if the training program increases scores?. What is the conclusion for the test at [Picture]
To test the hypothesis H0: ? = 100 vs. H1: ? > 100, a z-score of 2.8 is calculated. The probability of observing a z-score of 2.8 or one that is even larger, assuming the true mean is really equal to 100, is
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