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36 cars of the same model that were sold in a dealership and the number of days that each one remained in the dealership y

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36 cars of the same model that were sold in a dealership, and the number of days that each one remained in the dealership yard before being sold is determined. The sample average is 9.75 days, with a sample standard deviation of 2, 39 days. Construct a 95% confidence interval for the population mean number of days that a car remains on the dealership's forecourt

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Answer to a math question 36 cars of the same model that were sold in a dealership, and the number of days that each one remained in the dealership yard before being sold is determined. The sample average is 9.75 days, with a sample standard deviation of 2, 39 days. Construct a 95% confidence interval for the population mean number of days that a car remains on the dealership's forecourt

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CI=\overline{x}\pm Z\frac{s}{\sqrt{n}} =9,75±1,9600×(2,39/√36) =9,75±0,781 O intervalo de confiança é [8,969 – 10,531].

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