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Sampling and Estimation Practice Test

By — McGraw-Hill Professional
Updated on Aug 26, 2011

Review the following concepts if necessary:

Sampling and Estimation Practice Test

A good score is 8 correct.

  1. Primary source data is
    1. collected by someone else and then used by a statistician
    2. collected and used by a statistician
    3. another expression for a confidence interval
    4. another expression for a parameter
  2. Estimation gives a result that is almost always
    1. an approximation
    2. exact
    3. primary source data
    4. secondary source data
  3. In order to get the best possible estimate of the standard deviation for a certain characteristic of an infinite population, we should
    1. make the sample set as large as we can
    2. use the smallest sample set we can get away with
    3. test all the elements in the population
    4. test 1000 elements at random
  4. As the width of the confidence interval in a normal distribution decreases, the probability of a randomly selected element falling within that interval
    1. decreases
    2. does not change
    3. increases
    4. approaches a value of 68%
  5. If items are repeatedly selected at random, with replacement, from a set of 750,000 elements:
    1. the size of the set does not change
    2. the size of the set increases
    3. the size of the set decreases
    4. the size of the set becomes zero
  6. Suppose you have a normal distribution, and you have good estimates of the mean and standard deviation. Which of the following cannot be determined on the basis of this information?
    1. The 60% confidence interval.
    2. The 80% confidence interval.
    3. The 90% confidence interval.
    4. All of the above (a), (b), and (c) can be determined on the basis of this information.
  7. Which of the following is not necessarily a problem in an experiment?
    1. A biased sample.
    2. The replacement of elements when they should not be replaced.
    3. The use of a random number table.
    4. Failing to compensate for factors that can skew the results.
  8. A sampling frame is
    1. a subset of a sample
    2. a subset of a population
    3. an element of a sample
    4. an element of a population
  9. Suppose you want to determine the percentage of people in your state who smoke more than five cigarettes a day. Which of the following samples should you expect would be the best (least biased)?
    1. All the people in the state over age 95.
    2. All the hospital patients in the state.
    3. All the elementary-school students in the state.
    4. Every person in the state who was born on June 17.
  10. When sampling is done without replacement in an infinite set:
    1. the size of the set does not change
    2. the size of the set increases
    3. the size of the set decreases
    4. the size of the set becomes zero

Answers

  1. b
  2. a
  3. a
  4. a
  5. a
  6. d
  7. c
  8. b
  9. d
  10. a
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