Question

A magazine includes a report on the energy costs per year for​ 32-inch liquid crystal display​...

A magazine includes a report on the energy costs per year for​ 32-inch liquid crystal display​ (LCD) televisions. The article states that

1414

randomly selected​ 32-inch LCD televisions have a sample standard deviation of

​$3.843.84.

Assume the sample is taken from a normally distributed population. Construct

9898​%

confidence intervals for​ (a) the population variance

sigmaσsquared2

and​ (b) the population standard deviation

sigmaσ.

Interpret the results.

​(a) The confidence interval for the population variance is

​(nothing​,nothing​).

​(Round to two decimal places as​ needed.)

Math   Statistics-And-Probability   
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Answer #1

Given that sample size n = 14

alpha level = 1- confidence level = 1-0.98 = 0.02

sample standard deviation s = 3.84

(A) confidence interval for variance

(B) Confidence interval for standard deviation is given as

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