Ten Randomly Selected items for both A 9.7 10.6 9.5 10.2 10.0 10.5 10.4 10.1 9.9 10.9 B 10.4 10.5 10.7 10.9 10.3 10.4 10

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Ten Randomly Selected Items For Both A 9 7 10 6 9 5 10 2 10 0 10 5 10 4 10 1 9 9 10 9 B 10 4 10 5 10 7 10 9 10 3 10 4 10 1 (69.8 KiB) Viewed 11 times

Ten Randomly Selected items for both A 9.7 10.6 9.5 10.2 10.0 10.5 10.4 10.1 9.9 10.9 B 10.4 10.5 10.7 10.9 10.3 10.4 10.3 10.8 11.0 11.0 Both items are normally distrubuted with unknown means and variances. Assume that both have equal variances (i) Construct a 95% confidence interval of the difference in mean for the two solutions (ii) At the 5% significance level, test the null hypothesis that the difference between the mean etch rates of solution A and solution B is 0.1.