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An investor wants to estimate the effect of JD Power quality awards on return. 41 companies who won these awards are sampled and the return

An investor wants to estimate the effect of JD Power quality awards on return. 41 companies who

won these awards are sampled and the return was found to be 14.75 with a sample standard deviation

of 8.18. Find:

a. 80% confidence interval for the mean return.

b. 90% confidence interval for the mean return.

c. 95% confidence interval for the mean return.

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