Mean 0.60, standard deviation 0.03, shape unknown D.Mean 0.60, standard deviation 0.03, approximately normal 8.Scores on the mathematics part of the SAT exam in a recent year followed a normal distribution with mean 515 and standard deviation 114. You choose an SRS of 100 students and calculate 𝑥̅, the mean SAT Math Score. Which of the following are the mean and standard deviation of the sampling distribution of 𝑥̅? mean=16.05Standard Dev.= 0.1n=4Since data is normal we can use 2 std. dev. from the mean large populationmean= 10 X 0.85Std. Dev. = square root (10 X 0.85 X (1-0.85))approximately normal by the 10% rulemean 55/100= 0.55Std.dev. = square root (250 X 0.55 X (1-0.55))mean stays the same but the std.dev. changes and the square root of 100 from the srs
9.In a congressional district, 55% of the registered voters are Democrats. Which of the following is closest to the probability of getting less than 50% Democrats in a random sample of size 100? 10.A statistic is an unbiased estimator of a parameter when normcdf (0,50,m,std.dev)= 0.157Stats= parameter = unbiased