Exercises#3 The manager at Air Express thinks that weights of packages shipped recently are less than...

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Exercises#3 The manager at Air Express thinks that weights of packages shipped recently are less than in the past. Records show that in the past packages have had a mean weight of Ho 16.7 KG and a standard deviation of6.5 KG, a random sample of last months shipping records yielded a mean weight of X- 14.6 KG for 64 packages. Is this sufficient evidence to reject the null hypothesis in favor of the managers claim? a) Construct the null and alternative hypothesis. b) At significance level of a 0.01, give your conclusion.

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ivin - 6-5 ky. 1 U 14.6 kg. In=64 6.10」 d = 0.01 The null 4 alternative hypotksis is. crnd The test statstic is 4.6ー16.7-ー2-5 8 5 6-51 P-value P(Z S-2.525) p-value - 0.0013 _ using Z-table bscrvc that Condusion-Thee is usficiat cvidnre to Shippd recently are dess than in h past

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