Question 333315
35 employees who completed two years college were asked to take basic mathematics test. The mean and standard deviation of their scores were 75.1 and 12.8 respectively. In a random sample of 50 employees who only completed high school, the mean and standard deviation of the test scores were 72.1 and 14.6 respectively. Estimate with 90% confidence the difference in mean scores between the two groups of employees.
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I ran a 2-Smple T interval on a TI-84 and got the following:
90% CI: -1.978 < u1-u2 < 7.9778
with df = 78.7865
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Cheers,
Stan H.