Shell, a major oil company conducted a study recently to estimate the mean liters of petrol purchased by customers per visit to a petrol station. To do this, a random sample of customers was selected with the following data being recorded that show the liters of petrol purchased. 8.7 22.4 9.5 13.3 18.9 22 14.4 35.7 19 18.9 5.7 15.7 8.9 22.5 15.9 Based on these sample data. Construct and interpret a 95 percent confidence interval estimate for the population mean.

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