By Stan Gibilisco — 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.

- Primary source data is
- collected by someone else and then used by a statistician
- collected and used by a statistician
- another expression for a confidence interval
- another expression for a parameter

- Estimation gives a result that is almost always
- an approximation
- exact
- primary source data
- secondary source data

- In order to get the best possible estimate of the standard deviation for a certain characteristic of an infinite population, we should
- make the sample set as large as we can
- use the smallest sample set we can get away with
- test all the elements in the population
- test 1000 elements at random

- As the width of the confidence interval in a normal distribution decreases, the probability of a randomly selected element falling within that interval
- decreases
- does not change
- increases
- approaches a value of 68%

- If items are repeatedly selected at random, with replacement, from a set of 750,000 elements:
- the size of the set does not change
- the size of the set increases
- the size of the set decreases
- the size of the set becomes zero

- 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?
- The 60% confidence interval.
- The 80% confidence interval.
- The 90% confidence interval.
- All of the above (a), (b), and (c) can be determined on the basis of this information.

- Which of the following is not necessarily a problem in an experiment?
- A biased sample.
- The replacement of elements when they should not be replaced.
- The use of a random number table.
- Failing to compensate for factors that can skew the results.

- A sampling frame is
- a subset of a sample
- a subset of a population
- an element of a sample
- an element of a population

- 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)?
- All the people in the state over age 95.
- All the hospital patients in the state.
- All the elementary-school students in the state.
- Every person in the state who was born on June 17.

- When sampling is done without replacement in an infinite set:
- the size of the set does not change
- the size of the set increases
- the size of the set decreases
- the size of the set becomes zero

**Answers**

- b
- a
- a
- a
- a
- d
- c
- b
- d
- a

From Statistics Demystified: A Self-Teaching Guide. Copyright © 2004 by The McGraw-Hill Companies. All Rights Reserved.

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