STAT 310 EXAM WITH CORRECT SOLUTION
If you want to study the effect of hormonal changes in adolescent boys, your population
would be - ANSWER all adolescent males
If you want to study the effect of hormonal changes as boys reach adolescence, your
sample would most likely include - ANSWER pre-adolescent and post-adolescent boys
Which of the following is most likely to be measured categorically? - ANSWER species of
dogs appearing in the Sunday comics
Another name for measurement data is _______ data. - ANSWER quantitative and
numerical
To produce good estimates of population parameters we need to have a _______ sample.
- ANSWER representative or random
Suppose that you poured out a bag of M&Ms and found 48 blues, 35 greens, 30 reds, and
15 browns. Which of the following seems like the most reasonable conclusion to draw? -
ANSWER It is impossible to tell what the manufacturer is doing in terms of proportions of
colors
Inferential statistics are primarily concerned with - ANSWER making inferences about a
population from a sample
When given a cup of coffee before a race, a sample of runners were found to run the
race faster than without coffee. If we then conclude that on average, runners run faster
after drinking coffee, this would be an example of - ANSWER a statistical inference
Which of the following is true? - ANSWER a sample refers to the observations drawn
from a population
For a researcher to be able to accurately estimate the parameters of a population of
interest from his or her sample, the sample must be - ANSWER representative and
random
A researcher obtained attractiveness ratings on a scale from 1 to 100. She then
classified people into "attractive" and "unattractive" groups on the basis of these
scores. In this example, the researcher used _______ data to create _______ data. -
ANSWER measurement; categorical
An example of a statistical inference is - ANSWER generalizing data from a sample of
girls to a population of girls
Without a representative, random sample, we cannot - ANSWER accurately estimate the
parameters of a population
, The amount of time it takes you to open a child-proof container is an example of -
ANSWER measurement data
A psychologist was interested in predicting the number of times a young adult had been
arrested from that person's attendance in high school. The number of arrests is -
ANSWER the dependent variable
Why are we interested in categorizing data as nominal, ordinal, interval or ratio? -
ANSWER it will influence the type of analysis we can perform
If we are comparing the adrenaline scores of children who live near an airport with
those who live away from an airport, the independent variable is - ANSWER distance
from the airport
In the preceding question the dependent variable is - ANSWER adrenaline
Which of the following is a discrete variable? - ANSWER depression score on a Likert
scale
The Greek letter S (∑ ) is a symbol for - ANSWER summation
Which of the following is most certainly an ordinal scale? - ANSWER Ratings scores of
movies on Rotten Tomatoes
Professor Jeffrey assigned each of his students a number, then, randomly selected 20
students for his study by using a table of random numbers. Professor Jeffrey was
interested in whether the type of feedback received would affect the level of happiness
in his students. The students were either praised or insulted, then the levels of
happiness were measured by a questionnaire administered at the end of the study. What
is the type of this study? - ANSWER experimental study
In the above study, what is the independent variable? - ANSWER feedback
In an experiment, an independent variable is _______ and a dependent variable is
_______. - ANSWER manipulated, measured
Ordinal scales... - ANSWER provide information by ordering people, objects, or events
along some continuum that has meaning (Think: good, better, best)
When _______ is used, every subject in a study has an equal chance of being placed in
each of the groups being formed? - ANSWER random assignment
Assume that you have a set of data of 70 values spread fairly evenly between 0 and 100.
We would say these data would be approximately - ANSWER Uniformly distributed
Outliers are - ANSWER extreme or unusual values
Assume that we had the following set of data:
Score:
If you want to study the effect of hormonal changes in adolescent boys, your population
would be - ANSWER all adolescent males
If you want to study the effect of hormonal changes as boys reach adolescence, your
sample would most likely include - ANSWER pre-adolescent and post-adolescent boys
Which of the following is most likely to be measured categorically? - ANSWER species of
dogs appearing in the Sunday comics
Another name for measurement data is _______ data. - ANSWER quantitative and
numerical
To produce good estimates of population parameters we need to have a _______ sample.
- ANSWER representative or random
Suppose that you poured out a bag of M&Ms and found 48 blues, 35 greens, 30 reds, and
15 browns. Which of the following seems like the most reasonable conclusion to draw? -
ANSWER It is impossible to tell what the manufacturer is doing in terms of proportions of
colors
Inferential statistics are primarily concerned with - ANSWER making inferences about a
population from a sample
When given a cup of coffee before a race, a sample of runners were found to run the
race faster than without coffee. If we then conclude that on average, runners run faster
after drinking coffee, this would be an example of - ANSWER a statistical inference
Which of the following is true? - ANSWER a sample refers to the observations drawn
from a population
For a researcher to be able to accurately estimate the parameters of a population of
interest from his or her sample, the sample must be - ANSWER representative and
random
A researcher obtained attractiveness ratings on a scale from 1 to 100. She then
classified people into "attractive" and "unattractive" groups on the basis of these
scores. In this example, the researcher used _______ data to create _______ data. -
ANSWER measurement; categorical
An example of a statistical inference is - ANSWER generalizing data from a sample of
girls to a population of girls
Without a representative, random sample, we cannot - ANSWER accurately estimate the
parameters of a population
, The amount of time it takes you to open a child-proof container is an example of -
ANSWER measurement data
A psychologist was interested in predicting the number of times a young adult had been
arrested from that person's attendance in high school. The number of arrests is -
ANSWER the dependent variable
Why are we interested in categorizing data as nominal, ordinal, interval or ratio? -
ANSWER it will influence the type of analysis we can perform
If we are comparing the adrenaline scores of children who live near an airport with
those who live away from an airport, the independent variable is - ANSWER distance
from the airport
In the preceding question the dependent variable is - ANSWER adrenaline
Which of the following is a discrete variable? - ANSWER depression score on a Likert
scale
The Greek letter S (∑ ) is a symbol for - ANSWER summation
Which of the following is most certainly an ordinal scale? - ANSWER Ratings scores of
movies on Rotten Tomatoes
Professor Jeffrey assigned each of his students a number, then, randomly selected 20
students for his study by using a table of random numbers. Professor Jeffrey was
interested in whether the type of feedback received would affect the level of happiness
in his students. The students were either praised or insulted, then the levels of
happiness were measured by a questionnaire administered at the end of the study. What
is the type of this study? - ANSWER experimental study
In the above study, what is the independent variable? - ANSWER feedback
In an experiment, an independent variable is _______ and a dependent variable is
_______. - ANSWER manipulated, measured
Ordinal scales... - ANSWER provide information by ordering people, objects, or events
along some continuum that has meaning (Think: good, better, best)
When _______ is used, every subject in a study has an equal chance of being placed in
each of the groups being formed? - ANSWER random assignment
Assume that you have a set of data of 70 values spread fairly evenly between 0 and 100.
We would say these data would be approximately - ANSWER Uniformly distributed
Outliers are - ANSWER extreme or unusual values
Assume that we had the following set of data:
Score:
