Question 1

If the sample mean of a continuous variable is 120 and the standard deviation is 5, where would 99% of the data fall? (Assume normal distribution)

Accepted Answer

A)   110.2 - 129.8
B)   107.1 - 132.9
C)   148.4 - 187.6
D)   Cannot say.E) A) and D)
F) A) and C) B

Question 2

If the standard deviation of a sample of 1000 individuals is 10, then the standard error of the mean is:

Accepted Answer

A)   10.
B)   .01.
C)   100.
D)   None of these.E) B) and C)
F) A) and D)

Question 3

The idea behind sampling is to:

Accepted Answer

A)   obtain a sample of manageable size.
B)   make inferences from a sample to a population.
C)   understand the properties of specific sample drawn.
D)   All of these.E) A) and B)
F) B) and C)

Question 4

If rho= .10 and n= 120. Calculate the design effect (deff) .

Accepted Answer

A)   11.9
B)   12.9
C)   13.9
D)   14.9E) C) and D)
F) None of the above

Question 5

A researcher wishes to study the correlation of divorce and IQ levels of emerging adults. She randomly samples students from Oxford University where she teaches. What could be a possible problem with her sample?

Accepted Answer

A)   Oxford University students may not have the time to complete the survey.
B)   The sample is not representative of the population of emerging adults in terms of IQ, learning ability, social status, etc.
C)   Her sample may be too small since the parents of Oxford University students do not get divorced.
D)   There is no problem with her sample.E) All of the above
F) A) and D) B

Question 6

Which of the following statements is true?

Accepted Answer

A)   Standard deviation is a measure of dispersion from the mean.
B)   Design effects are unaffected by the cluster homogeneity.
C)   CATI surveys are longer than personal interview surveys.
D)   None of these.E) C) and D)
F) A) and B)

Question 7

Sampling distribution tells us:

Accepted Answer

A)   the probability of obtaining a particular value of a statistic in one sample.
B)   the distribution of values on a particular variable in a particular sample.
C)   the area distribution of the sample in a particular city.
D)   None of these.E) C) and D)
F) B) and C)

Question 8

Structured questionnaires are the most common form of data collection for surveys.

Accepted Answer

A) True 
 B)False

Question 9

In a Quota sampling of 100 individuals, if we know that there are 80% computer-users in our population, we would set quotas of:

Accepted Answer

A)   80 computer-users and 20 non-users.
B)   20 computer-users and 80 non-users.
C)   50 computer-users and 50 non-users.
D)   None of these.E) A) and B)
F) None of the above

Question 10

Quota sampling divides the sample up into separate sub-groups and then selects random samples from within each group.

Accepted Answer

A) True 
 B)False

Question 11

The difference in the precision of an estimate produced by a complex design and that by a simple random sample is referred to as the design effect.

Accepted Answer

A) True 
 B)False

Question 12

Unit non-response is when:

Accepted Answer

A)   only one of the respondents failed to complete the survey.
B)   no information was obtained from one or more of the sample units.
C)   one of the items in the survey was not completed.
D)   All of these.E) All of the above
F) A) and B)

Question 13

A deft value of 3 indicates:

Accepted Answer

A)   that the standard error is three times as large as it would have been had the design had been a simple random sample.
B)   that the standard error is 1.5 as large as it would have been had the design been a simple random sample.
C)   that the standard error is one-third times as it would have been had the design been a simple random sample.
D)   None of these.E) B) and D)
F) All of the above

Question 14

A simple random sample (SRS) gives every unit in the population an equal probability of selection.

Accepted Answer

A) True 
 B)False

Question 15

A researcher should be particularly worried about non-response bias when:

Accepted Answer

A)   there is non-response to the survey.
B)   the sample is very large.
C)   the sample is very small.
D)   the design effect is large.E) None of the above
F) A) and B)

Question 16

Even when the distribution of the variable in the population is not normal, the sampling distribution becomes more and more similar to the normal distribution as:

Accepted Answer

A)   the sample size increases.
B)   the sampling technique is changed.
C)   the sample size decreases.
D)   the standard deviation increases.E) A) and D)
F) C) and D)

Question 17

Web-surveys may not always be the best option because:

Accepted Answer

A)   there is still a significant minority of the population who do not have access to the Internet.
B)   there is no list of Internet users that can be used to draw random samples.
C)   the quality of data obtained can be lower in the absence of an interviewer.
D)   All of these.E) A) and D)
F) All of the above D

Question 18

A researcher finds that his data are normally distributed around a mean of 168. Is he right in assuming that 95% of his sample cases will be within the range 148.4 to 187.6?

Accepted Answer

A)   Yes
B)   No
C)   Depends on the nature of the experiment
D)   Can't say. Need more informationE) C) and D)
F) A) and B)

Question 19

The response rate is calculated by dividing the number of achieved interviews by the eligible issued sample size.

Accepted Answer

A) True 
 B)False

Question 20

The precision of an estimate is affected by three factors:

Accepted Answer

A)   population variance, sampling technique, and sample standard deviation.
B)   sample size, population variance, and location of participants.
C)   population variance, sampling technique, and sample size.
D)   population mean, population standard deviation, and population variance.E) A) and C)
F) B) and C)

Exam 15: Surveys and Sampling

If the sample mean of a continuous variable is 120 and the standard deviation is 5, where would 99% of the data fall? (Assume normal distribution)

Correct AnswerverifiedB

If the standard deviation of a sample of 1000 individuals is 10, then the standard error of the mean is:

Correct AnswerverifiedShow Answer

The idea behind sampling is to:

Correct AnswerverifiedShow Answer

If rho= .10 and n= 120. Calculate the design effect (deff) .

Correct AnswerverifiedShow Answer

A researcher wishes to study the correlation of divorce and IQ levels of emerging adults. She randomly samples students from Oxford University where she teaches. What could be a possible problem with her sample?

Correct AnswerverifiedB

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Sampling distribution tells us:

Correct AnswerverifiedShow Answer

Structured questionnaires are the most common form of data collection for surveys.

Correct AnswerverifiedShow Answer

In a Quota sampling of 100 individuals, if we know that there are 80% computer-users in our population, we would set quotas of:

Correct AnswerverifiedShow Answer

Quota sampling divides the sample up into separate sub-groups and then selects random samples from within each group.

Correct AnswerverifiedShow Answer

The difference in the precision of an estimate produced by a complex design and that by a simple random sample is referred to as the design effect.

Correct AnswerverifiedShow Answer

Unit non-response is when:

Correct AnswerverifiedShow Answer

A deft value of 3 indicates:

Correct AnswerverifiedShow Answer

A simple random sample (SRS) gives every unit in the population an equal probability of selection.

Correct AnswerverifiedShow Answer

A researcher should be particularly worried about non-response bias when:

Correct AnswerverifiedShow Answer

Even when the distribution of the variable in the population is not normal, the sampling distribution becomes more and more similar to the normal distribution as:

Correct AnswerverifiedShow Answer

Web-surveys may not always be the best option because:

Correct AnswerverifiedD

A researcher finds that his data are normally distributed around a mean of 168. Is he right in assuming that 95% of his sample cases will be within the range 148.4 to 187.6?

Correct AnswerverifiedShow Answer

The response rate is calculated by dividing the number of achieved interviews by the eligible issued sample size.

Correct AnswerverifiedShow Answer

The precision of an estimate is affected by three factors:

Correct AnswerverifiedShow Answer

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B

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B

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D

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