(Answered) A precision instrument is guaranteed to read accurately to

Finance

A precision instrument is guaranteed to read accurately to within 2 units. A sample of four instrument readings on the same object yielded the measurements 353,351,351,355. CI= 95% for sigma

a. Test the null hypothesis that sigma = .7 against the alternative sigma>.7. Use a=.05

b. Find the 90% CI for the population variance

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