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The following random sample was selected from a normal distribution: 11, 13 , 5 , 18 , 19 , 4 , 15 , 5 ,

The following random sample was selected from a normal distribution:

11,13 ,5 ,18 ,19 ,4 ,15 ,5 ,5 ,8

(a)Construct a90% confidence interval for the population mean.

(b)Construct a95% confidence interval for the population mean.

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