QUESTION 9 Past experience has indicated breaking distributed and hata 47 psLA n

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QUESTION 9 Past experience has indicated breaking distributed and hata 47 psLA ndom san ple ofnine specimens is tested, and de average breaking strength is fund to be 964 psi The 95% confidence interval for the true mean breaking strength is written as (A ; B).Find the value of B7 round your answer to three digits that the breaking strength of yarn used in manufacturing drapery material is normally 1 pointsSave Answer QUESTION 10 dient uted and that o 5 ps A rand a sample of nine p eme s is tested, and the average breaking strength is found to be 28.4 psi. The 95% confidence interval for he ne mean breaking strength is written as (A ; B). Find the value of A? round your answer to three digits. 1 points Save Answer

Explanation / Answer

9. x' = 96.4 = 4.7 z = 1.96 n = 9

B = x' + z / n

= 96.4 + 1.96 * 4.7 / 9

= 99.471.

10. x' = 28.4 = 5.3 z = 1.96 n = 9

A = x' - z / n

= 28.4 - 1.96 * 5.3 / 9

= 24.937.

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