Question

Questions 1-2:  A recent Fox News poll of 1016 registered

voters in the US revealed that 77% currently disapprove of the job that Congress is doing. Suppose that percentage applies to all registered voters in the US.

1.True/False: It is possible that 80% of registered voters disapprove of the job that Congress is doing because of too much gridlock.

True

False

2.The probability that four randomly selected registered voters in the US all DO NOT disapprove of the job that Congress is doing is which of the following?

a.(0.23)*4

b.(0.77)*4

c.(0.23)^4

d.(0.77)^4

e.None of the above.

Questions 3-5: IQ scores are normally distributed with a mean of 100 and standard deviation of 10.

3.Approximately what percentage of IQ scores will fall between 90 and 110?

a.16%

b.50%

c.68%

d.84%

4.For a sample of size n=25 from this population, what is the probability that the sample mean IQ score will be greater than 102?

a.0.16

b.0.25

c.0.5

d.0.68

e.0.84

5.From which of the following samples would the sample mean IQ be more likely to be greater than 105?

a.Sample size of n=25

b.Sample size of n=100

c.Equally likely for both samples.

 

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