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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= 289.30 and s₁ = 22.5, and another random sample of 16 gears from the second supplier results in x₂ = 322.50 and sy = 21. Use only Table V of Appendix A. (a) Is there evidence to support the claim that supplier 2 provides gears with higher mean impact strength? Use a 0.05, and assume that both populations are normally distributed but the variances are not equal. Round your answer to 4 decimal places < P-value < Is there evidence to support the claim? Yes (b) Do the data support the claim that the mean impact strength of gears from supplier 2 is at least 25 foot-pounds higher than that of supplier 1? Find bounds on the P-value making the same assumptions as in part (a). Round your answer to 2 decimal places. < P-value < is there evidence to support the claim? 1 Concuk Na
(c) Construct an appropriate 95% confidence interval on the difference in mean impact strength. Use only Table V of Appendix A. Round your answers to 3 decimal places. ≤1₂-11 S Does the confidence interval support the claim that the mean impact strength of gears from supplier 2 is at least 25 foot-pounds higher than that of supplier 1? Yes, 25 is contained in the confidence interval.