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A random sample of 100 daily stock returns was taken. The average return in the sample...

A random sample of 100 daily stock returns was taken. The average return in the sample appeared to be 4.81%. The population standard deviation is not known, but the sample standard deviation is known to be 0.9%. (show your work) a. Calculate a 95% confidence interval for the average stock return b. How big the sample size be for the margin of error of 0.1% at the confidence level 95%? c. A fund manager claims that the average stock return is higher than 4.81%. Test the fund manager’s claim with the 5% level of significance

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