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Neoliberalism

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The following questions are taken from old practice exams found under PRACTICE EXAMS under ASSIGNMENTS. SOLUTIONS/ANSWERS TO THESE CAN BE FOUND UNDER PRACTICE EXAMS UNDER ASSIGNMENTS.
PRACTICE EXAM IIA 1 THRU 6, 8, 9, 14
1. The standard normal distribution has mean ______ and standard dev. ______.
2. Let z be a random variable with a standard normal distribution. Find P(-2 < z < 1.2).

3. The life of a turntable is normally distributed with mean 2.3 years and std dev. .4 year. Find the probability that a turntable breaks down within 2 years. ( 4 decimal places)

4. For a random variable that is normally distributed, with mean 80 and standard deviation sigma = 20, determine the probability that a random sample of 4 items will have a mean that is greater than 100.

5. Find the area under the standard normal curve which lies : a. To the right of z = -1.04 b. Between z = .3 and z = 2.1 c. To the left of z = 1 6. The sample size is increased from 300 to 2700. What happens to the standard error?
a) State whether it increases or decreases
b) The new error is ________times the old error. 8. Consider the following probability mass function x p(x) -1 .3 1 .4 5 .3

a. Calculate E(X)
b. Calculate Var(X)
c. Find P(X > 1)
d. Find P(X greater than or equal to 1)

9. If the probability is .1 that a student gets into graduate school, what is the probability that out of 5 students,
a. exactly 5 get into graduate school b. at most 1 gets into graduate school 14. Find the value of z for which the area under the standard normal curve to the right of z is equal to .65

PRACTICE EXAM IIB 1 THRU 6, 8, 11, 13, 14
1. If the probability is .3 that a student gets sick during the semester, what is the probability that out of 13 students:

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