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A Sports good company advertises that it will deliver your product within 15 days of purchase. A sample of 49 past custo...

A Sports good company advertises that it will deliver your product within 15 days of purchase. A sample of 49 past customers is taken. The average delivery time in the sample was 16.2 days with a standard deviation of 5.6 days.

a) Test the claim of the company at the 5% level of significance.

b) compute the probability of a Type II error if the true average delivery time is 17 days after purchase.

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Answer #1

: 16.2 days S= 5-6days a) Nuthy poherisAuenog delivey time in 1s da Avenay Aunate s delivery time 01 = 5% Significa nee : looThe lijt sta tiste ㅚ 16-2-15 5. 6 49 5-6 t. 50 zcal 1.50 = 0.066801 The desult ndt signiticant at f Lo.05, we accept Ho lb 1え < 1.3160-Hヲ 1-2 IS-3160-1チ c 0- 8 O 04998S - 0.9Soo 0.956) 951. -Y Type. 끄 esso

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