The waiting time for Restaurant DD to deliver your food when ordering online is normally distributed. A random sample of 6 days in the last month indicated the following waiting times (in minutes) 41 33 42 38 37 35
(a) [1 mark] Determine the sample mean and standard deviation. You may use your calculator, so no justification is needed.
(b) [1 mark] What critical value would you use to construct a 95% confidence interval? Explain your choice.
(c) [2 marks] Construct a 95% confidence interval on the waiting time for the food delivery from Restaurant DD.
(d) [2 marks] Using your answer from (c), is it likely that the true mean waiting time is 33 minutes? Why or why not?
(e) [2 marks] Is it possible that the true mean waiting time is 33 minutes? If the true mean waiting time was 33 minutes, then what would you say about this sample?
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