Deck 15: Sampling and Sample Size

Question 1

Snowball sampling refers to:

A) beginning with small samples and proceeding to larger ones
B) seeking respondents via a referral strategy
C) proceeding through various stages
D) none of the above

Answer 1

B

Question 2

Population, within sampling procedures, refers to:

A) the population of any given society
B) the entire group one wishes to study
C) the valid number of cases in statistical analysis
D) the list from which a researcher selects respondents

Answer 2

B

Question 3

With a confidence level of 95%, you can be confident that your sample will be accurate:

A) 9 out of 10 times
B) 19 out of 20 times
C) within 5% of the time
D) 9.9 times out of 10
E) none of the above

Answer 3

B

Question 4

For a sample to accurately reflect a large population, it must be:

A) statistically significant
B) relevant to that population
C) representative
D) non-probabilistic

Question 5

Stratified samples ensure that individuals within a sampling group:

A) may use simple random sampling techniques within categories
B) tend to over-represent minorities
C) have unequal likelihoods of being selected
D) all of the above

Question 6

Quota samples are satisfied when:

A) the desired number of qualified respondents is realized
B) the list of respondents has been exhausted
C) the desired number of respondents, regardless of qualifications, is reached
D) referrals have been exhausted

Question 7

The sampling fraction is expressed by:

A) population sample size
B) (sd pop)2
C) sample size population
D) n + (1) (n) + (N)

Question 8

Stratified samples are employed:

A) only when simple random samples are appropriate
B) when systematic samples are not possible
C) as much as possible due to their superiority
D) when you wish to represent categories of different sizes
E) none of the above

Question 9

Multi-stage area samples are used when:

A) one wants to sample randomly in different areas
B) one wants to sample a group for which no possible list exists
C) all other types of sampling -probabilistic or not- are not possible
D) interviewers must, in different areas, make sampling decisions

Question 10

A systematic sample differs from a simple random sample in that:

A) it is superior
B) it is inferior
C) it employs a predetermined list of potential respondents
D) its results are subject to tests of statistical significance

Question 11

It is possible to draw samples which are:

A) probabilistic
B) non-probabilistic
C) randomly determined
D) all of the above
E) none of the above

Question 12

A convenience sample is one which:

A) satisfies the desired number of respondents
B) solicits the opinions of respondents who are reached in the easiest manner
C) proceeds on a referral basis
D) all of the above

Question 13

The sampling frame refers to:

A) the entire group one wishes to study
B) the list from which one selects respondents
C) those who respond to delivered questionnaires
D) a list used only in non-probabilistic procedures

Question 14

To adjust a sample size where n = computed sample size, and N= estimated size of the universe, use which of the following:

A) n + (n) nm
B) n + (1 + n + N)
C) n ÷ (1 + (n ÷ N))
D) n + (1 + n - N)2

Question 15

A simple random sample is an example of:

A) a probabilistic sampling technique
B) a non-probabilistic sampling technique
C) the worst form of sampling
D) none of the above

Question 16

The first step in determining a sample size is to:

A) compute the sampling fraction
B) select a major variable to determine the size
C) decide on the confidence level to be used
D) adjust the sample size for cost and time

Question 17

Sampling is conducted in order to:

A) save time
B) save money
C) to reflect attitudes of larger groups
D) all of the above
E) none of the above

Question 18

Probability sampling procedures involve techniques for:

A) determining statistical significance
B) selecting pre-determined sampling units
C) selecting sampling units such that each has an unknown chance of being selected
D) selecting sampling units such that each has a known chance of being selected
E) none of the above

Question 19

Given the relationship between sample size and accuracy, to double accuracy, one must:

A) double the sample size
B) quadruple the sample size
C) halve the sample size
D) leave alone the sample size, improve methodology

Question 20

Which of the following may be used to compute a sample size:

A) sample size = (confidence limit) x (sd pop)2 (accuracy)
B) sample size = ((confidence limit) x (sd pop) (accuracy)2
C) sample size = (confidence limit) x (accuracy) (sd pop)
D) sample size = (confidence limit) (sd pop) x (accuracy)2