Question

When we are describing how spread out, or different, the values of the sample statistic are

when one takes repeated samples, we are talking about

A. variability.

B. bias.

C. convenience sampling.

D. response errors.

E. undercoverage.

5. When a random sample of 150 dog owners was surveyed about whether they had ever

driven a car with their dog sitting on their lap, 10% said “yes.” What is the estimated margin

of error for this survey?

A. 1%

B. 5%

C. 6.7%

D. 8.2%

E. 10%

6. Return to Question 5. How would increasing the sample size from 150 to 500 change the

estimated margin of error?

A. The estimated margin of error increases as the sample size gets bigger.

B. The estimated margin of error decreases as the sample size gets bigger.

C. The estimated margin of error will not change since it is not affected at all by sample

size.

D. It is impossible to answer this question without knowing the size of the population.

E. It is impossible to answer this question without knowing what percentage of the sample

of 500 answered “yes’ to the survey question.

Answer 1

(4)

Correct option:

B.   bias

Explanation:

Bias is te tendency of a measurement process to over - estimate or under - estimate the value of the population parameter.

(5)

Correct option:

5%

Explanation:

n = 150

= 0.1

SE =

Margin of Error = 1.96 X 0.0245 = 0.0480 = 5%

(6)

Correct option:

B   The estimated margin of error decreases as the sample size gets bigger.

Explanation:

As the Sample Size (n) increases, the Margin of Error (E) decreases.