(Answered) For the historical period 1926-2015 here are the sample

Statistics

For the historical period 1926-2015, here are the sample statistics for the inflation-adjusted total returns on investment grade corporate bonds:

sample size: n = 90
x_mean = 3.38%
s = 9.50%

Construct the one-sample t-confidence interval for a 0.95 level confidence interval for the population mean return.

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