The sampling distribution of sample O population means O sample means O population Question 2 Z= X-H ox O the standard deviation O the given population mean O the z-score = the given sample mean is the distribution of the sample means for all possible samples of a given size, n. x- In this formula for calculating a standard score, the x-bar symbol represents O (in 6 pts U n Question 3 In the formula for calculating a standard score, the sample size used to create the sampling distribution O population mean O sample mean O population standard deviation Question 4 An important tool used to solve z problems and do z calculations is a/an O Z table O chi square table O t table O Z calculator Question 5 The normal curve is very useful in solving various kinds of problems because of one of its unique features known as O positive skewness OO represents the O negative skewness O standard distribution O symmetry 6 pts 6 pts 6 pts - D When converting a numeric value to a standard score, we are simply calculating that value's O variance O standard deviation O mean Oz score Question 7 One of the primary advantages of converting a numeric value into its standard score is that standard scores have no O units of measure O measures of association O distributions O negative values Question 8 O 9.1% O 0.91% O 91% to complicate calculations. Suppose that X is the time it takes a randomly chosen professor in a university department to type and send a standard letter of recommendation for a past student who is applying for a graduate degree program. Suppose X has a normal distribution, and assume the mean is 10.5 minutes and the standard deviation 3 minutes. If you were to take a random sample of 50 professors and measure the time it takes each one of them to type and send such a standard letter of recommendation, what is the probability that their mean time is less than 9.5 minutes? O 0.091% 6 pts 6 pts