Two independent samples were collec ted. For the fi rst sample of 42 items, the mean was 32.3 and the variance 9. The second sample of 57 items had a mean of 34 and a variance of 16. (a) Compute the estimated standard error of the difference between the two means. (b) Using α = 0.05, test whether there is suffi cient evidence to show the second population has a larger mean.
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