Mary Ann is comparing the first year costs of attending a two year and four year university. The results are shown in the tables below. If Mary Ann's family invests $8,000 in a savings account that has 7.5% compound interest for 10 years, how much more money will her family need to save in order to go to the 4 year college for one year?

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Math question.. plz me .. best answer all

A. find the power of the test, when the null hypothesis assumes a population mean of mu = 450, with a population standard deviation of 156, the sample size is 5 and the true mean is 638.47 with confidence intervals of 95 b. find the power of the test, when the null hypothesis assumes a population mean of mu = 644, with a population standard deviation of 174, the sample size is 3 and the true mean is 744.04 with confidence intervals of 95% c. find the power of the test, when the null hypothesis assumes a population mean of mu = 510, with a population standard deviation of 126, the sample size is 10 and the true mean is 529.44 with confidence intervals of 95