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A random sample of 121 checking accounts at a bank showed an average daily balance of $280. The standard deviation of the population is known

A random sample of 121 checking accounts at a bank showed an average daily balance of $280. The standard deviation of thepopulationis known to be $66.

a.Find the standard error of the mean.

b.Give a point estimate of the population mean.

c.Construct an 80% confidence interval for the population mean.d.Construct a 95% confidence interval for the population mean.

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