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Question 4 (11 marks) Grocery stores and large retailers have installed self-checkout systems so that shoppers can scan their own items and cash out themselves.
Question 4 (11 marks)
Grocery stores and large retailers have installed self-checkout systems so that shoppers can scan their own items and cash out themselves. Below shows the number of customers using the service for a sample of 20 days.
120, 108, 120, 114, 118, 91, 118, 91, 104, 112, 97, 118, 108, 117, 120, 121, 100, 110, 105, 117
Please use python code to answer the questions below. Codes must be displayed and for each question, give justifications to your answer.
- Is it reasonable to conclude that the mean number of customers using the self-checkout system is more than 100 per day? Use 0.05 level of significance for all tests.
- Can the same conclusion as in (a) be drawn at 0.01 level of significance for all tests?
- Describe how confidence interval can be used to arrive at the same conclusion as in (a) and (b).
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