Carry out a simulation experiment using a statistical computer package or other software to study the sampling distribution of X when the population distribution is lognormal with E[ln(X)] ¼ 3 and V[ln(X)] ¼ 1. Consider the four sample sizes n ¼ 10, 20, 30, and 50, and in each case use 500 replications. For which of these sample sizes does the X sampling distribution appear to be approximately normal?

The graph shows the distance y, in inches, a pendulum moves to the right (positive displacement) and to the left (negative displacement), for a given number of seconds x. how many seconds are required for the pendulum to move from its resting position and return? enter your answer in the box.

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?

Graph y = -|x| + 2. click on the graph until the correct one appears.