1. With a large amount fo data and small enough intervals, you will eventually get a perfectly symmetrical bell-shaped curve. This is also referred to as a:

A. left-skewered distribution B. right-skewered distribution C. U-shaped distribution D. normal distribution

1. If X~N (10,81), then the standard deviation equals:

A. 10 B. 9 C. 3 D. 1

1. If X~N (15,4), then 95% of the data fall in the interval:

A. 9-21 B. 11-19 C. 13-17 D. 15-17

1. What is the mean value for the normal approximation to a binomial experiment with 55 repetitions and a probability of success of 30%?

A. x=30 B. x=16.5 C. x=1.83 D. x=1650

1. Suppose X~N(50,4²). What value of x would have a z-score of -2.10?

A. x=21.8 B x=41.6 C. x=-21.8 D. x=-41.6