A precision instrument is guaranteed to read accurately to within 2 units. A sample of four...

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, 350, 351, and 356.

(a)Test the null hypothesis that σ = 0.7 against the alternative σ > 0.7. Use α = 0.05.

State the test statistic. (Round your answer to three decimal places.)

χ² =

(b)Find a 90% confidence interval for the population variance. (Round your answers to three decimal places.)

_________ to _________.

Expert Solution

orchestra answered 2 years ago

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