5)The Maximum Likelihood Estimate for the population standard deviation when a sample 2, 3, 4, 7 and 10 is drawn from a normal population with unknown mean and unknown variance is: a. 4 b. 5.2 c. 2.93 approximately d. 8.56 6)Suppose a sample of size n=25 picked from the Poisson distribution, the sample mean was found to be equal to 9. A point estimate of the of the population mean is: a. 5 b. 25 c. 9 d. 0.36 7)The confidence level for the upper confidence bound of the population mean with unknown standard deviation is 99.2% when a sample is picked from a normal population, then the corresponding Z , is: a. 2.41 b. 2.65 c. 2.67 d. -2.65