If the sample size increase form n = 9 to n = 100, then comparing to the case of n=9, the probability that X falls within 2 units of the population mean
(i. e., 10 – 2(S. E.) (A) higher
(B) lower
(C)
same
(D)
cannot tell

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297