Question

Two suppliers manufacture a plastic gear used in a laser printer. The impact strength of these gears measured in foot-pounds is an important characteristic. A random sample of 10 gears from supplier 1 results in x1 = 290 and s1 = 12, and another random sample of 16 gears from the second supplier results in x2 = 304 and s2 = 22. Construct a confidence interval estimate for the difference in mean impact strength upper value of the 95% CI of μ2 − μ1 ? Please report your answer up to 2 decimal places.

Answer 1

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