Additional GO Tutorial Problem 10.002 Your answer is partially correct. Try agai

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Additional GO Tutorial Problem 10.002 Your answer is partially correct. Try again The diameter of steel rods manufactured on two different extrusion machines is being investigated. Two random samples of sizes n1 13 and n2 16 are selected, and the sample means and sample variances are R1 8.73, si 0.35, 2 8.68, s 0.40 respectively. Assume that the data are drawn from a normal distribution Construct the following (using only Table VI of Appendix A): (a) A 90% two-sided CI on 01 02 Round your answers to 3 decimal places. CI: .354 2.302 (b) A 95% two-sided CI on 01 02 Round your answers to 3 decimal places. 1296 2.822 CI which of the following is a true statement regarding the widths of the 90% and 95% CIs? 1. The width of the 95% CI is larger because we have more confidence in the 95% interval.

Explanation / Answer

for 12 and 15 degree if freedom :

A) 90% CI : 0.618 ; 1.573

B)95% CI: 0.561 ; 1.721

c) lower confidence bound for above degree of freedom =0.689

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