Statistics Final Exam Review
Questions and Answers
While Professor Ford is at the theater watching Pitch Perfect, she selects a red sour
patch kid out of her candy box. If she wants her candy selection to be a true random
sample, she must put the red sour patch kid back into the box before selecting another
piece of candy. This is an example of sampling with... - ANSWER-Replacement
When calculating probability, the number of _______ is divided by the number of
possible outcomes. - ANSWER-Successful Outcomes
What is the probability of X>2 for the following set of N = 6 scores: 2, 2, 8, 8, 8, and 8? -
ANSWER-4/6 or 2/3
The relationship between _______ and ________ is usually defined in terms of
probability. - ANSWER-Samples and Populations
In terms of direction and body/tail, what is the best way to describe the probability
indicated by the following: p(z < -1.00)? - ANSWER-Tail to the Left
In terms of direction and body/tail, what is the best way to describe the probability
indicated by the following: p( z > -1.00)? - ANSWER-Body to the Right
The major problem with z-score. - ANSWER-Require more information than is typically
available
A t-distribution is _________ than a z distribution. - ANSWER-Flatter and more spread
out
Step one of hypothesis testing using z-scores. - ANSWER-State the Hypothesis
Cohen's d is a measure of.. - ANSWER-Effect size
One of the assumptions of hypothesis testing with z-scores is that each member of a
population has an equal chance of being selected for a sample. This is referred to as....
- ANSWER-Random Sampling
The boundaries of the critical region are defined by _______. - ANSWER-Alpha levels;
a
, A one-tailed hypothesis test can also be referred to as a ________ hypothesis test
because it makes a statement about the direction of the effect (i.e. treatment decreases
symptomology OR treatment increases feelings of euphoria) - ANSWER-Directional
If the value of the t statistic falls within the critical region, a researcher can... -
ANSWER-Accept the alternative; reject the null
A researcher selects to use a __________ to compare the self-esteem of two groups:
preteen girls and preteen boys. - ANSWER-Independent Measures t-test
A researcher decides to observe changes in preteen girls' self-esteem over time using a
________. - ANSWER-Repeated measures t-test
An independent-measures t statistic is used to evaluate the mean difference between 2
treatments with n=50 in one treatment and n=50 in the other. There are _______
degrees of freedom for the t statistic. - ANSWER-98
The mean difference was significant t (127)= 6.35, p<.01, d=1.95. The percentage of
error is.... - ANSWER-1%
____________ is an average of two sample variances that is used when the variances
in samples are not equal. - ANSWER-Pooled Variance
In a single sample t test, the percent of variance explained is also referred to as
_______. - ANSWER-R squared
Difference. - ANSWER-Variance
In ANOVA, factor is synonymous with _______. - ANSWER-an Independent Variable
In ANOVA, the various values of a factor are ______. - ANSWER-Levels
What statistic is yielded by an ANOVA? - ANSWER-F-ratio
What advantage does an ANOVA have over a t-test? - ANSWER-2+ treatments, more
flexibility
When conducting an ANOVA, the total variability is divided into two basic components
______ and ________. - ANSWER-Between-treatments and within-treatments variance
In ANOVA, what value is expected, on average, for the F-ratio when the null hypothesis
is true? - ANSWER-1.00 because the top and bottom of the ratio are both measuring
the same variance
The scales of measurement used in non-parametric tests. - ANSWER-Nominal or
Ordinal
Questions and Answers
While Professor Ford is at the theater watching Pitch Perfect, she selects a red sour
patch kid out of her candy box. If she wants her candy selection to be a true random
sample, she must put the red sour patch kid back into the box before selecting another
piece of candy. This is an example of sampling with... - ANSWER-Replacement
When calculating probability, the number of _______ is divided by the number of
possible outcomes. - ANSWER-Successful Outcomes
What is the probability of X>2 for the following set of N = 6 scores: 2, 2, 8, 8, 8, and 8? -
ANSWER-4/6 or 2/3
The relationship between _______ and ________ is usually defined in terms of
probability. - ANSWER-Samples and Populations
In terms of direction and body/tail, what is the best way to describe the probability
indicated by the following: p(z < -1.00)? - ANSWER-Tail to the Left
In terms of direction and body/tail, what is the best way to describe the probability
indicated by the following: p( z > -1.00)? - ANSWER-Body to the Right
The major problem with z-score. - ANSWER-Require more information than is typically
available
A t-distribution is _________ than a z distribution. - ANSWER-Flatter and more spread
out
Step one of hypothesis testing using z-scores. - ANSWER-State the Hypothesis
Cohen's d is a measure of.. - ANSWER-Effect size
One of the assumptions of hypothesis testing with z-scores is that each member of a
population has an equal chance of being selected for a sample. This is referred to as....
- ANSWER-Random Sampling
The boundaries of the critical region are defined by _______. - ANSWER-Alpha levels;
a
, A one-tailed hypothesis test can also be referred to as a ________ hypothesis test
because it makes a statement about the direction of the effect (i.e. treatment decreases
symptomology OR treatment increases feelings of euphoria) - ANSWER-Directional
If the value of the t statistic falls within the critical region, a researcher can... -
ANSWER-Accept the alternative; reject the null
A researcher selects to use a __________ to compare the self-esteem of two groups:
preteen girls and preteen boys. - ANSWER-Independent Measures t-test
A researcher decides to observe changes in preteen girls' self-esteem over time using a
________. - ANSWER-Repeated measures t-test
An independent-measures t statistic is used to evaluate the mean difference between 2
treatments with n=50 in one treatment and n=50 in the other. There are _______
degrees of freedom for the t statistic. - ANSWER-98
The mean difference was significant t (127)= 6.35, p<.01, d=1.95. The percentage of
error is.... - ANSWER-1%
____________ is an average of two sample variances that is used when the variances
in samples are not equal. - ANSWER-Pooled Variance
In a single sample t test, the percent of variance explained is also referred to as
_______. - ANSWER-R squared
Difference. - ANSWER-Variance
In ANOVA, factor is synonymous with _______. - ANSWER-an Independent Variable
In ANOVA, the various values of a factor are ______. - ANSWER-Levels
What statistic is yielded by an ANOVA? - ANSWER-F-ratio
What advantage does an ANOVA have over a t-test? - ANSWER-2+ treatments, more
flexibility
When conducting an ANOVA, the total variability is divided into two basic components
______ and ________. - ANSWER-Between-treatments and within-treatments variance
In ANOVA, what value is expected, on average, for the F-ratio when the null hypothesis
is true? - ANSWER-1.00 because the top and bottom of the ratio are both measuring
the same variance
The scales of measurement used in non-parametric tests. - ANSWER-Nominal or
Ordinal
