Stat 300 Exam 102 Questions with Verified Answers
A sample in which the subjects themselves decide whether to be included in the
study. - CORRECT ANSWER What is voluntary response sample?
1. Sampling method
2. Context of the data
3. Source of the data - CORRECT ANSWER Which of the following is typically the
important factor to consider when conducting a statistical analysis of data?
The likelihood of getting these results by chance is very small. - CORRECT ANSWER
What does it mean for the findings of a statistical analysis of data to be statistically
significant?
sampling method - CORRECT ANSWER If we are collecting sample data for a study,
the _ that we choose can greatly influence the validity of our conclusions. For
example, we can use sound statistical methods to analyze data in voluntary
response samples, but the results are not necessarily valid.
A parameter is a numerical measurement of a population; a statistic is a numerical
measurement of a sample. - CORRECT ANSWER How do parameter and statistic
differ?
Data that were obtained from an entire population. - CORRECT ANSWER Which of
the following is associated with a parameter?
,People with special interests are more likely to respond, so the sample is likely to
be biased. - CORRECT ANSWER Why is a voluntary response sample generally
unsuitable for methods of statistics?
To learn to distinguish between statistical conclusions that are likely to be valid
and those that are seriously flawed. - CORRECT ANSWER What is the goal of
learning statistics?
A survey in which the sponsor can enjoy monetary or other gains from the results.
- CORRECT ANSWER What is a self-interest study?
With a random sample, each individual has the same chance of being selected.
With a simple random sample, all samples of the same size have the same chance
of being selected. - CORRECT ANSWER What is the difference between a random
sample and a simple random sample?
Cluster - CORRECT ANSWER Which sampling method divides the population up
into sections, randomly selects some of those sections, then choose all the
members from the selected sections to study?
Stratified - CORRECT ANSWER Which sampling method subdivides the population
into categories sharing similar characteristics and then selects a sample from each
subdivision?
Randomization - CORRECT ANSWER _is used when subjects are assigned to
different groups through a process of random selection.
, Simple random sample - CORRECT ANSWER Which of the following corresponds to
the case when every sample of size n has the same chance of being chosen?
Variation - CORRECT ANSWER Which characteristic of data is a measure of the
amount that the data values vary?
Outliers - CORRECT ANSWER _are sample values that lie very far away from the
majority of the other sample values.
Frequency distribution - CORRECT ANSWER A frequency distribution helps us
understand the nature of the distribution of a data set.
subtracting a lower-class limit from the next consecutive lower-class limit -
CORRECT ANSWER Class width is found by
relative frequency - CORRECT ANSWER In a relative frequency distribution, the
frequency of a class is replaced with a proportion or percent.
frequency - CORRECT ANSWER The heights of the bars of a histogram correspond
to frequency values.
touch - CORRECT ANSWER The bars in a histogram touch.
shape of the distribution - CORRECT ANSWER A histogram aids in analyzing the _
of the data.
A sample in which the subjects themselves decide whether to be included in the
study. - CORRECT ANSWER What is voluntary response sample?
1. Sampling method
2. Context of the data
3. Source of the data - CORRECT ANSWER Which of the following is typically the
important factor to consider when conducting a statistical analysis of data?
The likelihood of getting these results by chance is very small. - CORRECT ANSWER
What does it mean for the findings of a statistical analysis of data to be statistically
significant?
sampling method - CORRECT ANSWER If we are collecting sample data for a study,
the _ that we choose can greatly influence the validity of our conclusions. For
example, we can use sound statistical methods to analyze data in voluntary
response samples, but the results are not necessarily valid.
A parameter is a numerical measurement of a population; a statistic is a numerical
measurement of a sample. - CORRECT ANSWER How do parameter and statistic
differ?
Data that were obtained from an entire population. - CORRECT ANSWER Which of
the following is associated with a parameter?
,People with special interests are more likely to respond, so the sample is likely to
be biased. - CORRECT ANSWER Why is a voluntary response sample generally
unsuitable for methods of statistics?
To learn to distinguish between statistical conclusions that are likely to be valid
and those that are seriously flawed. - CORRECT ANSWER What is the goal of
learning statistics?
A survey in which the sponsor can enjoy monetary or other gains from the results.
- CORRECT ANSWER What is a self-interest study?
With a random sample, each individual has the same chance of being selected.
With a simple random sample, all samples of the same size have the same chance
of being selected. - CORRECT ANSWER What is the difference between a random
sample and a simple random sample?
Cluster - CORRECT ANSWER Which sampling method divides the population up
into sections, randomly selects some of those sections, then choose all the
members from the selected sections to study?
Stratified - CORRECT ANSWER Which sampling method subdivides the population
into categories sharing similar characteristics and then selects a sample from each
subdivision?
Randomization - CORRECT ANSWER _is used when subjects are assigned to
different groups through a process of random selection.
, Simple random sample - CORRECT ANSWER Which of the following corresponds to
the case when every sample of size n has the same chance of being chosen?
Variation - CORRECT ANSWER Which characteristic of data is a measure of the
amount that the data values vary?
Outliers - CORRECT ANSWER _are sample values that lie very far away from the
majority of the other sample values.
Frequency distribution - CORRECT ANSWER A frequency distribution helps us
understand the nature of the distribution of a data set.
subtracting a lower-class limit from the next consecutive lower-class limit -
CORRECT ANSWER Class width is found by
relative frequency - CORRECT ANSWER In a relative frequency distribution, the
frequency of a class is replaced with a proportion or percent.
frequency - CORRECT ANSWER The heights of the bars of a histogram correspond
to frequency values.
touch - CORRECT ANSWER The bars in a histogram touch.
shape of the distribution - CORRECT ANSWER A histogram aids in analyzing the _
of the data.
