Unformatted text preview: Given the above data: • State the null and the alternative hypothesis in symbols and words. • Calculate the 95% confidence interval and decide whether based on this interval you reject or fail to reject the null. • Interpret the confidence interval. H0: μ = 100 Ha: > 100 95% CI = X +/- 1.96 * S ( X ) S ( X ) = S / N = 15/ 15 = 1 (the 15 in the denominator is the square root of 225) 95% CI = 110 +/- 1.96 * 1 = (108, 112) Since the 95% CI does not include the value of the population mean or = 100, we reject the null and conclude that the students in this district are more intelligent than the general population. We are 95% sure that their IQ scores fall between 108 to 112....
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This note was uploaded on 06/09/2008 for the course STATS 112 taught by Professor Esfandini during the Spring '08 term at UCLA.
- Spring '08