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1.25 points QUESTION Assume that you have a sample of nt -9, with the sample mean XbarT40and a sample standard deviation of 51-5, and you have an independent sample of n2-15 from another population with a sample mean of Xbar235, and the sample standard deviation - Construct a 99% confidence inerval estimate of the population mean difference between 1 and -3.39.213.39 13.23.30 3.391 213.39 13.-2016.) 1.25 points QUESTIONS Nowaf wants to estimate the number of the residents who have not graduated high school in the northeast section of her cry. It is known that nearly 0.25 residents Mave not graduated. She draws a random sample of 1806 residents and finds that 8500 have not graduated from high school if the confidence level is 99%. The critical value is 11.96 1.645 1.25 points St AS QUESTION 9 in a one-tail hypothesis test where you reject HD only in the uppertal, what is the critical value of the test statistic with 30 degrees of freedom at the 0.01 level of significance 2368 3565 2457