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SEE SCREEN SHOT FOR REFERENCE Since the p-value is : greater or less than the significance level 0.05 , the null hypothesis: Fails to be

SEE SCREEN SHOT FOR REFERENCE

Since the p-value is : greater or less than the significance level 0.05

, the null hypothesis: Fails to be rejected or is rejected

Sufficient evidence: Does or Does Not

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A major retailer promises 2 day shipping for certain online orders. A consumer advocacy group believes that the shipping times are longer at a signicance level of 0.05, and checks a randomly chosen sample of 400 orders. The results of the sample are given below. Shipping times Mean 2.05602454 Variance 0.48326032 Observations 400 Hypothesized Mean 2 df 399 t Stat 1.611824412 P(T

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