Question

Use the given information to find the number of degrees of​ freedom, the critical values chi Subscript Upper L Superscript 2 and chi Subscript Upper R Superscript 2​, and the confidence interval estimate of sigma. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Platelet Counts of Women 95​% ​confidence; n=26​, s=65.9

Answer 1

given data are:-

sample size (n) = 26

sample sd(s) = 65.9

the critical value for 95% confidence level be:-

	excel function	value
	=CHISQ.INV.RT(0.025,25)	40.6465
	=CHISQ.INV.RT(0.975,25))	13.1197

the 95% confidence interval for the standard deviation be:-

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