Mathematics homework help


Please explain work on each problem. (The ages of seniors at Betropolis University are not Normally distributed. A random sample of 24 students has a sample mean of 22 and a sample standard deviation of 2.3 years. Estimate the population mean for a 95% confidence level. Your final answers should be correct to 2 places after the decimal point.The estimate of population mean: __________<< ____________You must use the T – distribution.) Attachment 1Attachment 2Financial data for the rates of return of two stocks A and B for 4 years is as per table.yearAB1Probability0.40.820.250.71.20.253-0.5-0.60.2540.61.00.25A portfolio of the two stocks puts equal amount of money in A and B.1. Find the covariance of A and B.2. Find the expected value of the portfolio rate of return.Find the standard deviation of the portfolio rate of returnFind the Sharpe Ratio; that is the ratio of the expected value to the standard deviation.A random sample of 225 exams score drawn from a large population of students has amean of 60 and a sample standard deviation of 9.3. Estimate the population mean with a confidence level of 95%.Estimate the population mean with a confidence level of 98%.< H <Your final answers should be correct to 4 places after the decimal point.4. For a confidence level of 95% assuming the same statistics find the sample size thatwould result in a margin of error of 1.5.For a sample size of 225 find the level of confidence that would result in a margin oferror of 1.5.Your final answers should be correct to 3 places after the decimal point.5. A poll of 100 voters shows that 66 of them would vote for Boris for Treasurer ofBetropolis.Estimate the proportion of votes that he would get from the population with aconfidence level of 95%.Estimate the proportion of votes that he would get from the population with aconfidence level of 90%.Your final answers should be correct to 3 places after the decimal point.

 

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