Confidence interval estimate of the unknown population
A sample of n = 9 scores is obtained from an unknown population. The sample mean is M = 46 with a standard deviation of s = 6. Use the sample data to make an 80 % confidence interval estimate of the unknown population.
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In each and every of the four examples listed below, one of the given variables is independent (x) and one of given variables is dependent (y). Point out in each case which variable is independent and which variable is dependent.
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Pay attention to the assumptions of this test, and ask, "Does it make sense to interpret the mean of this dependent variable?"