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2. (a. to g. 26 points) A courier service advertises that its average delivery time is less than 7.5 hours for local deliveries. A random sample of 8 deliveries to an address across town was recorded. These data are shown below (in hours). 8.21 5.98 4.25 5.48 4.78 7.35 6.45 2.95 7.23 4.92

Siudents Name (d) (10 points) Is there sufficient evidence at the 5% level of significance tical va to support Then apply the critical value lest the hypotheses. Make your conclusion in the context of the the couriers advertisement? State the hypotheses. problem. (e) (2 points) Was it a z test or a f test in (d)? Briefly explain your answer. (f) (5 points) Provide a 95% confidence interval estimate for the couriers average time for local deliveries. (g) (3 points) Can we conclude at the 95% level of confidence that the couriers average time for local deliveries is less than 7.5 hours? Briefly explain your answer.
math   Statistics-And-Probability   
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from stuisticable we get Single 46119463 6 845036Page No. Dato Hefe confidinie inteeval.so eesec

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