PSYCH 302 FINAL QUESTIONS AND
ANSWERS
Another term for the independent variable is: - ANSWER-the predictor variable
Measuring someone's height based on number of stacked apples is
___________________. - ANSWER-valid but not reliable
By following two groups of people, one group who smokes (and smoked before
entering the research study), and one group who doesn't smoke (and never smoked
before entering the research study) a researcher is engaging in
_________________ research.
Check all that apply. - ANSWER-quasi-experimental, non-experimental
Some additional, unmeasured variable that relates to the independent variable and
may also cause changes in the dependent variable is called a _______________. -
ANSWER-confound
A researcher believes that the type of music someone listens to will cause someone
to feel a certain way. In this example, the _______________ is the independent
variable, and the _________________ is the dependent variable. - ANSWER-type of
music; mood
Match the variable with its appropriate scale of measurement. - ANSWER-type of
car: normal, order: ordinal, shoe size: interval, number of hairs: ratio
For a particular variable, Kana lists all the values in ascending order, then identifies
the middle number, or the average of the 2 middle numbers. This results in a
measure of ___________________ called the _____________. - ANSWER-central
tendency; mean
Sasha wants to let her readers know how many observations she collected for a
particular variable. The appropriate letter to represent this is: - ANSWER-N
The 50th percentile is also known as - ANSWER-the median
The following equation refers to:
∑(𝑋−𝑀)2𝑁−1 - ANSWER-variance
In the equations for population variance and standard deviation, "N" in the
denominator refers to the number of observations for a given variable. However,
when calculating variance or standard deviation for a particular sample, we use
_____________ to account for bias. - ANSWER-n-1
Most researchers report the standard deviation as the prime measure of variability.
This is because it can be interpreted in terms of the ____________ units, unlike the
variance. - ANSWER-original
, A researcher is interested in the age at which infants learn to recognize faces. He
decides to measure infant age as "number of days since birth". This represents the
researcher's ____________________ definition - ANSWER-operational
To be honest, Likert scales, such as "rate how outgoing you are on the scale from 1
to 5", are ordinal. But we treat them as _______________ . - ANSWER-interval
f a teacher gives everyone a grade based on the month they were born, this would
be a _____________________ measure of how well students did in the course. -
ANSWER-reliable but not valid
Which of the following scenarios includes a quasi-independent variable? - ANSWER-
Younger and older adults are compared in terms of their crystalized intelligence,
Depression rates are compared between men and women
Imagine you are a psychologist at a track-and-field event. Match the scale of
measurement with the appropriate variable. - ANSWER-nominal: color, ordinal:
places, interval: judges scores, ratio: time
When referring to the mean of a sample, researchers typically use the letter -
ANSWER-M
In statistics, "N" refers to: - ANSWER-total # observations
Unlike the standard deviation, variance is in terms of _____________ units and is
_________________. - ANSWER-squared; difficult to interpret
What value always has a z-score of 0? - ANSWER-mean
The normal distribution is ____________, meaning that if you fold it in half vertically
down the middle, both sides would be _______________. - ANSWER-symmetrical;
identical
Given no other information, is the sample mean an unbiased estimate of the
population mean? - ANSWER-yes
If you obtain a sample mean of 21.54, how would you calculate the LOWER limit of
the confidence interval? - ANSWER-Subtract 1.96*SE from the sample mean
If a researcher reported a small range for the 95% confidence interval, you can
conclude that - ANSWER-The researcher is fairly certain the obtained sample mean
is close to the population mean
With a very large sample size, you would have a _____________ standard error,
which would yield a ______________ confidence interval for the estimate. -
ANSWER-small; narrow
ANSWERS
Another term for the independent variable is: - ANSWER-the predictor variable
Measuring someone's height based on number of stacked apples is
___________________. - ANSWER-valid but not reliable
By following two groups of people, one group who smokes (and smoked before
entering the research study), and one group who doesn't smoke (and never smoked
before entering the research study) a researcher is engaging in
_________________ research.
Check all that apply. - ANSWER-quasi-experimental, non-experimental
Some additional, unmeasured variable that relates to the independent variable and
may also cause changes in the dependent variable is called a _______________. -
ANSWER-confound
A researcher believes that the type of music someone listens to will cause someone
to feel a certain way. In this example, the _______________ is the independent
variable, and the _________________ is the dependent variable. - ANSWER-type of
music; mood
Match the variable with its appropriate scale of measurement. - ANSWER-type of
car: normal, order: ordinal, shoe size: interval, number of hairs: ratio
For a particular variable, Kana lists all the values in ascending order, then identifies
the middle number, or the average of the 2 middle numbers. This results in a
measure of ___________________ called the _____________. - ANSWER-central
tendency; mean
Sasha wants to let her readers know how many observations she collected for a
particular variable. The appropriate letter to represent this is: - ANSWER-N
The 50th percentile is also known as - ANSWER-the median
The following equation refers to:
∑(𝑋−𝑀)2𝑁−1 - ANSWER-variance
In the equations for population variance and standard deviation, "N" in the
denominator refers to the number of observations for a given variable. However,
when calculating variance or standard deviation for a particular sample, we use
_____________ to account for bias. - ANSWER-n-1
Most researchers report the standard deviation as the prime measure of variability.
This is because it can be interpreted in terms of the ____________ units, unlike the
variance. - ANSWER-original
, A researcher is interested in the age at which infants learn to recognize faces. He
decides to measure infant age as "number of days since birth". This represents the
researcher's ____________________ definition - ANSWER-operational
To be honest, Likert scales, such as "rate how outgoing you are on the scale from 1
to 5", are ordinal. But we treat them as _______________ . - ANSWER-interval
f a teacher gives everyone a grade based on the month they were born, this would
be a _____________________ measure of how well students did in the course. -
ANSWER-reliable but not valid
Which of the following scenarios includes a quasi-independent variable? - ANSWER-
Younger and older adults are compared in terms of their crystalized intelligence,
Depression rates are compared between men and women
Imagine you are a psychologist at a track-and-field event. Match the scale of
measurement with the appropriate variable. - ANSWER-nominal: color, ordinal:
places, interval: judges scores, ratio: time
When referring to the mean of a sample, researchers typically use the letter -
ANSWER-M
In statistics, "N" refers to: - ANSWER-total # observations
Unlike the standard deviation, variance is in terms of _____________ units and is
_________________. - ANSWER-squared; difficult to interpret
What value always has a z-score of 0? - ANSWER-mean
The normal distribution is ____________, meaning that if you fold it in half vertically
down the middle, both sides would be _______________. - ANSWER-symmetrical;
identical
Given no other information, is the sample mean an unbiased estimate of the
population mean? - ANSWER-yes
If you obtain a sample mean of 21.54, how would you calculate the LOWER limit of
the confidence interval? - ANSWER-Subtract 1.96*SE from the sample mean
If a researcher reported a small range for the 95% confidence interval, you can
conclude that - ANSWER-The researcher is fairly certain the obtained sample mean
is close to the population mean
With a very large sample size, you would have a _____________ standard error,
which would yield a ______________ confidence interval for the estimate. -
ANSWER-small; narrow
