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Dmart wants to know the customer based on their purchases and whether the customers had...

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Accounting

image Dmart wants to know the customer based on their purchases and whether the customers had only one car, one bike or more than one car and/or bike. The results from a sample of 100 customers are as follows: sample mean of purchases is Rs. 1200 , sample standard deviation of purchases is Rs.250, 48 customers have car, 30 customers have bike and twenty two customers have more than one car and/or bike. (a) Construct a 95% confidence interval estimate for the population mean purchases made at Dmart [2] (b) Construct a 90% confidence interval estimate for the population proportion of customers who only had one bike [2]

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