In a table of 500 random digits

the digits from 0 to 9 are equally likely

If we take many simple random samples from the same population, we expect

the values of the statistic will vary from sample to sample

Which of the following is a source of nonsampling error in a sample survey?

Some subjects do not tell the truth.

An example of a nonsampling error that can reduce the accuracy of a sample survey is:

Many members of the sample cannot be contacted.

Which of the following is correct

statistics must be based on a simple random sample, parameters describe population characteristics

A tbl of random #s is used to select 30 ppl from a stats class to rate a video. The 30 ppl are

a simple random sample of the class

Using a newspaper poll does not give a trustworthy estimate of popular opinion because of

bias due to relying on voluntary response

When we take a census, we attempt to collect data from

every individual in the population

Increasing the size of an SRS has these beneficial effects:

the margin of error is smaller than it is for smaller SRSs.

When we say that a newspaper poll is biased, we mean that

repeated results give results different from one another, repeated polls miss the truth abt the pop in same direction

If a sampling method is biased then

we need to improve the sampling method to remove the bias.

Which of the following sources of error is included in the margin of error

chance variation in choosing a random sample.

A simple random sample (SRS) is

all individuals in the pop have equal chance to be selected., all possible samples have the same chance of being selected.

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Prob & Stat II Chapter 5 Test Review

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Prob & Stat II Chapter 5 Review

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Questions 20

Answers

1
In a table of 500 random digits
the number one will appear exactly 50 times
the number one will appear approximately 10 times
the average of these numbers will be 5
the digits from 0 to 9 are equally likely
2
Based on quick method, what happens to the MOE of the sample size is increased from 100 to 400?
It is divided by four
It remains the same
It is multiplied by two
It is divided by two
3
If we take many simple random samples from the same population, we expect
a problem with bias
a different value of the parameter for each sample
the same values of the statistic for each sample
the values of the statistic will vary from sample to sample
4
Which of the following is a source of nonsampling error in a sample survey?
Using voter registration lists as the sampling frame.
Voluntary response sampling.
None of these.
Some subjects do not tell the truth.
5
An example of a nonsampling error that can reduce the accuracy of a sample survey is:
Using voluntary response to choose the sample.
Using the telephone directory as the sampling frame.
Interviewing people at shopping malls to obtain a sample.
Many members of the sample cannot be contacted.
6
Which of the following is correct
statistics must be based on a simple random sample
parameters describe sample characteristics
the population is a subset of the sample
parameters describe population characteristics
7
Based on the 3 statistics in many samples, which is preferred as an estimate of the parameter?
C
B
A
Either A or B are equally good.
8
The statistic that has the largest bias among these three is
A
B
A & B have similar bias; larger than the bias of C.
C
9
A tbl of random #s is used to select 30 ppl from a stats class to rate a video. The 30 ppl are
the sampling frame
the population
a simple random sample of the class
a census
10
The statistic that has the lowest variability among these three is
B
A and C have the same variability.
A
C
11
To reduce the variability of estimates from a simple random sample, you should
increase the bias.
use a larger sample.
use a count, not a percent.
use a smaller sample.
12
Using a newspaper poll does not give a trustworthy estimate of popular opinion because of
bias due to suggestive wording of the question
bias due to relying on voluntary response
bias due to nonresponse
bias due to undercoverage
13
When we take a census, we attempt to collect data from
a stratified random sample
a voluntary response sample
every individual selected in a simple random sample
every individual in the population
14
Increasing the size of an SRS has these beneficial effects:
the margin of error is smaller than it is for smaller SRSs.
none of these.
nonsampling errors become less important
the bias of the sample is reduced relative to smaller SRSs.
15
When we say that a newspaper poll is biased, we mean that
none of these
repeated results give results different from one another
the questions asked show racial or gender bias
repeated polls miss the truth abt the pop in same direction
16
If a sampling method is biased then
we need to improve the sampling method to remove the bias.
the statistic will be close to the parameter.
we need to increase the sample size to remove the bias.
we should sample from a larger population
17
Which of the following sources of error is included in the margin of error
voluntary response.
errors in entering the data into the computer.
chance variation in choosing a random sample.
some of the subjects did not understand the questions.
18
Increasing the size of a probability sample
decreases the variability of a sample statistic
both red and yellow are true.
decreases the margin of error for a sample statistic.
increases the variability of a sample statistic.
19
Which of the following is NOT a source of bias in sample surveys
wording of the question
all are sources of bias
non-response
voluntary response
20
A simple random sample (SRS) is
all individuals in the pop have equal chance to be selected.
the same as a stratified sample
all possible samples have the same chance of being selected.
the least expensive method for a national sample survey.

Prob & Stat II Chapter 5 Test Review Flashcards | StudBud