A teacher knows that scores on one of her teata are heavily left skewed, with a mean score of 78 and a standard deviation of 18. She randomly selecta 15 grades and record the mean score. What is the shape of the distribution
of the sample mean for all possible random samples of size 15 from this population?
skewed lett
skewed right
approximately Normal
approximately uniform

Use a calculator to verify that σ(x) = 62, σ(x2) = 1034, σ(y) = 644, σ(y2) = 93,438, and σ(x y) = 9,622. compute r. (enter a number. round your answer to three decimal places.) as x increases from 3 to 22 months, does the value of r imply that y should tend to increase or decrease? explain your answer. given our value of r, y should tend to increase as x increases. given our value of r, we can not draw any conclusions for the behavior of y as x increases. given our value of r, y should tend to remain constant as x increases. given our value of r, y should tend to decrease as x increases.