A large mail order company is trying to decide between two delivery services: Canada Post and a private courier. The mail order company selects a random sample of 100 deliveries for the private courier, and another sample of 75 for Canada Post. The proportion of deliveries that were on time or early when sent by the private courier was 0.89. The proportion of deliveries that were on time or early when sent by Canada Post was 0.80.The mail order company has decided it will pay the higher cost of the private courier, if its on-time or early percentage is more than 5% higher than Canada Post's. Should the mail order company hire the private courier? Use α = 2.5%.
Answer to relevant QuestionsColleges work hard to convert offers of admission into acceptances. One college has been experimenting with phone calls from program faculty to prospective students to encourage students to accept offers of admission. In a ...If appropriate, test to see whether there is evidence of a negative relationship between semester average marks and hours spent working. Use α = 0.05. If appropriate, create a 95% prediction interval for the amount of monthly spending on restaurant meals, based on a monthly income of $6,000. Check that the requirements for the theoretical model are met for the data on semester average marks and hours spent working. When the professor checked the data, she noticed that there were two unusually low marks: a 22 and ...Interpret the coefficient of determination for the data on actual and recorded inventory values for Aries Car Parts (using the amended data set from Exercise 16). Does this give you confidence in the recorded inventory ...
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