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1) A coin is tossed 20 times. A person, who claims to have extrasensory perception, is asked to predict the outcome of each flip in advance. She predicts correctly on 16 tosses. What is the probability of being correct 16 or more times by guessing? Does this probability seem to verify her claim?

a) 0.0069, yes

b) 0.4931, yes

c) 0.4931, no

d) 0.0069, no

2) Which of the following is not a possible method for determining binormal probability:

a) using table of binomial probability

b) using the multinomial approximation to the binomial distribution

c) using normal approximation to the binomial distribution

d) using Poisson approximation to the binomial distribution

3) A probability question involves a random variable having a normal distribution. If the random variable involves ___________ , the continuity correction will Not be required.

a) number of employment ads

b) number of books purchased

c) number of boyfriends

d) number of cubic centimeters

4) A problem is solved by using the standard normal table and the formula =np:

a) involve Table I

b) involved the normal approximation to the binomial distribution

c) originally involved normal distribution

d) originally involved the Poisson distribution

5) Which of the following is most likely to have a normal distribution?

a) The number of people visiting a certain restaurant

b) The height of all adults in a certain town

c) The salaries of all adults in a certain town

d) The number of electric storms in the U.S. in a given year.

6) A probability question involves a random variable having a normal distribution. If the random variable involves ___________ , the continuity correction will be required.

a) number of minutes

b) number of feet

c) number of complaints

d) number of degrees

7) To determine the probability of obtaining exactly 20 successes in 50 trials withp=0.30, we should use the:

a) binomial formula

b) Table I

c) normal approximation to the binomial distribution

d) Poisson formula

8) Find the indicated probability.

In one region, the September energy consumption levels for single-family homes are found to be normally distributed with a mean of 1050 kWh and a standard deviation of 218 kWh. For a randomly selected home, find the probability that the September energy consumption level is between 1100 kWh and 1225 kWh.

a) 0.3791

b) 0.0910

c) 0.2881

d) 0.1971

9) Which of the following distributions is continuous?

a) normal distribution

b) multinomial distribution

c) binomial distribution

d) hypergeometric distribution

10) .Assume that z scores are normally distributed with a mean of 0 and a standard deviation of 1. If P (-a

a) 1.49

b) 0.57

c) -0.18

d) 0.3328