Question: For the multiple choice questions, circle the best answer. 1) If the size of a randomly selected sample from a population is increased from n

For the multiple choice questions, circle the best answer.

1) If the size of a randomly selected sample from a population is increased from n = 100 to n = 400, then the standard deviation will

A. increase by a factor of 4.

B. remain the same.

C. decrease by a factor of 2.

D. decrease by a factor of 4.

2) Which of the following statements is true about the standard deviation of p ?

A. It decreases as the sample size n increases.

B. It increases as the sample size n increases.

C. It changes each time a new sample is drawn.

D. It does not change as the sample size n increases.

3) Suppose that the mean of the sampling distribution for the dierence in two sample proportions is 0. This tells us that:

A. The two population proportions are equal to each other.

B. The two sample proportions are both 0.

C. The two population proportions are both 0.

D. The two sample proportions are equal to each other.

4) In which of the following scenarios is a paired design not appropriate?

A. Comparison of the accuracy of taking a person's temperature orally and in the ear, where each person's temperature is taken using both methods.

B. Comparison of the wear pattern on one's left shoe and one's right shoe.

C. Comparison of the average energy use of two brands of dishwashers.

D. Comparison of a cream and an ointment in the treatment of a rash, where the ointment is applied to half the rash and the cream to the other half.

5) A fourth grade class of 28 students is given a standardized math test. The mean score of the 12 boys is 25 with a standard deviation of 3. The mean score of the 16 girls is 24 with a standard deviation of 4. What is the standard error for the sampling distribution

A. 1 B. 1.32 C. 1.75 D. 1.87

6) A random sample of 600 adults is taken from a population of over one million, in order to compute a condence interval for a proportion. If the researchers wanted to decrease the width of the condence interval, they could

A. increase the size of the sample.

B. decrease the size of the population.

C. increase the size of the population.

D. decrease the size of the sample

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