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please answer 5 and 6

ASK YOUR TEACHER |-/2 POINTS MY NOTES DEVORESTAT9 7..044. The amount of lateral expansion (mils) was determined for a sample of n - 7 pulsed-power gas metal arc welds used in LNG ship containment tanks. The resulting sample standard deviation was s = 2.84 mils. Assuming normality, derive a 3% CI for o? and for 0. (Round your answers to two decimal places.) CI for op CI for o ) mils mils2 You may need to use the appropriate table in the Appendix of Tables to answer this question. Need Help? Read It Watch Talk to a Tutor -12.5 POINTS DEVORESTAT9 7..045. MY NOTES ASK YOUR TEACHER Wire electrical-discharge machining (WEDM) is a process used to manufacture conductive hard metal components. It uses a continuously moving wire that serves as an electrode. Coating on the wire electrode allows for cooling of the wire electrode core and provides an improved cutting performance. An article gave the following sample observations on total coating layer thickness (in um) of eight wire electrodes used for WEDM. 22 17 29 35 42 25 25 26 Calculate a 99% CI for the standard deviation of the coating layer thickness distribution. (Round your answers to two decimal places.) Is this interval valid whatever the nature of the distribution? Explain. Yes, there are enough data points for this interval to be valid. No, validity of this interval requires that coating layer thickness be at least approximately normally distributed. You may need to use the appropriate table in the Appendix of Tables to answer this question

Answer 1

5 corp en nor, s=2.84. 2 -0.01 x in-1 = 18.5475 2 from chisquerre table x-din-1 = 0.6757 / The gah c.1. sor 6 1 [in-los? Lo L[Ch.1252 Vaianin Ra/10H J 6x (2.8982 26 6x2.892 - o '6757 1.6153 L6 (8.4666 c. for 625 (2.69 , 71.68) c.I. for 6 = (1.62,8.67) Here 3 - Elxi-x2 - 6 = 60.5536 n-1 10.5475 n = 8, 2= 0.01 , do=n x2 = 20.2777 Xinda = 6-4893 =7 2 from chisquare table

% The gg Jenis2 c-7. 6.1 sor 6 chrios? 260.5836 L644 x 60.5538 (4.57 & 20.70) y @0.9893 No val (dity of this internal requires that coating layer thickness at least approximately normally distributed

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