Question 1
0 / 3 pts
If the nominal alpha is set to .05, what p value would not be considered
statistically significant?
Correct Answer
.222
Y Answered
.022
.034
.033
Question 2
3 / 3 pts
If the state of the world is that the null hypothesis should not be rejected and
researchers fail to reject it, they have committed:
C !
no error
Type I error
Type II error
Type III error
Question 3
3 / 3 pts
When researchers test a null hypothesis, they are looking for:
C !
disconfirmatory evidence
supportive data
a difference between individuals
misrepresentation in the sample
Question 4
0 / 3 pts
Researchers are comparing the intelligence levels of incoming freshmen and
graduating seniors. Assuming that there is a systematic difference in
intelligence levels between the two groups and researchers reject the null
hypothesis, they have committed
Correct Answer
no error
Type I error
Y Answered
Type II error
both Type I and Type II error
Question 5
3 / 3 pts
Which of these is an acceptable interpretation of a non-significant outcome
in research?
C !
researchers should fail to reject the null hypothesis
the null hypothesis should be accepted
the null hypothesis should be rejected
results must be incorrect
Question 6
0 / 3 pts
When we reject the null hypothesis we:
Correct Answer
claim there is a difference
reject the real hypothesis
Y Answered
claim there is no difference
reject the alternative hypothesis
Question 7
3 / 3 pts
All are possible outcomes to a study ACCEPT:
C !
reject the alternative hypothesis
fail to reject the null hypothesis
reject the null hypothesis
fail to reject the null hypothesis when we should have failed to reject the null
Question 8
3 / 3 pts
What types of participants is most susceptible to experimenter expectancy
effects?
C !
animals
children
adults
teenagers
Question 9
3 / 3 pts
What value determines the acceptable risk of committing a Type I Error?
C !
nominal Alpha level
Beta
population mean
sample standard deviation
Question 10
3 / 3 pts
If a researcher runs a two-tailed t-test (nominal alpha = .05) to see if there is
a difference in anxiety scores between men (n = 156) and women (n = 142),
which p value would not meet the criteria for rejecting the null hypothesis?
C !
.50
.032
.044
.0001
Question 1
0 / 3 pts
Statistical power is the probability of:
Correct Answer
obtaining a test statistic large enough to reject H0 when H0 is false
obtaining a test statistic large enough to reject H0 when H0 is true
obtaining a test statistic to accept H0 when it is true
Y Answered
rejecting a test statistic
Question 2
3 / 3 pts
A Type I error occurs if:
C !
researchers reject the null hypothesis when they should not have rejected it
researchers fail to reject the null hypothesis when they should have rejected
it
researchers reject the null hypothesis when they should have rejected it
researchers fail to reject the null hypothesis when they should not have
rejected it
Question 3
0 / 3 pts
What can lead to a large difference between a population mean and a
sample mean?
Correct Answer
sampling error
random sampling
Y Answered
an incorrect alpha level
a small test statistic
Question 4
3 / 3 pts
Which of these is an acceptable interpretation of a non-significant outcome
in research?
C !
researchers should fail to reject the null hypothesis
the null hypothesis should be accepted
the null hypothesis should be rejected
results must be incorrect
Question 5
0 / 3 pts
A Type I error occurs when we:
Correct Answer
reject the null hypothesis when we should have failed to reject the null
hypothesis
fail to reject the null hypothesis when we should have failed to reject the null
hypothesis
fail to reject the null hypothesis when we should have rejected the null
hypothesis
Y Answered
reject the null hypothesis when we should have rejected the null hypothesis
Question 6
0 / 3 pts
Statistical power is NOT dependent upon the:
Correct Answer
population mean
sample size
effect size
Y Answered
nominal alpha level
Question 7
0 / 3 pts
What is statistical power?
Correct Answer
the probability of rejecting the null hypothesis when it should be rejected
the probability of rejecting the null hypothesis when it should not be rejected
the probability of failing to reject the null hypothesis when it should be
rejected
Y Answered
the probability of failing to reject the null hypothesis when it should not be
rejected
Question 8
3 / 3 pts
In null hypothesis testing, what do researchers typically expect to find?
C !
data that is not compatible with the null hypothesis
proof that completely refutes the null hypothesis
evidence that the sample is systematically different from the represented
population
results that prove the research hypothesis is true
Question 9
3 / 3 pts
What can we know from our results of a study that we have failed to reject
the null hypothesis?
C !
the sample means were not statistically different from one another
we have committed Type II error
the theoretical population are not different from one another
there was no sampling error
Question 10
0 / 3 pts
Which is NOT needed to make a claim that the null hypothesis is correct?
Correct Answer
statistical significance
Y Answered
adequate sample size
sufficient statistical power
valid measures
Question 1
3 / 3 pts
Outliers are defined by:
C !
where the scores or values fall on a known (t, z, F) distribution
subtracting one from the sample size
the square root of variance
dividing the SS by the mean
Question 2
3 / 3 pts
We estimate error because:
C !
it helps understand the relationship between our sample and the population
it effects the standard deviation
its conventional to do so
our population is hypothetical
Question 3
3 / 3 pts
A one-tailed outlier for the t distribution must have a t score equivalent to
the:
C !
highest 5% or lowest 5% of the t distribution
highest 2.5% or lowest 2.5% of the t distribution
only the highest 5% of the t distribution
only the lowest 5% of the t distribution
Question 4
0 / 3 pts
N decreases the sampling distribution gets:
Correct Answer
wider
more pointy
Y Answered
more leptokurtic
more representative
Question 5
3 / 3 pts
In order to calculate the sum of squared deviations you must do all of the
following except for:
C !
calculate the square root of variance
calculate the mean
subtract the mean from each score
multiply the difference between each score and the mean by itself
Question 6
3 / 3 pts
As N decreases we can expect the standard error of the mean to:
C !
increase
decrease
neither increase nor decrease
either increase or decrease
Question 7
3 / 3 pts
What information do you need to find tcritical for a 95% CI?
C !
df
M
SEM
s
Question 8
3 / 3 pts
As N increases, the standard error of the mean:
C !
decreases
increases
remains constant
varies randomly
Question 9
0 / 3 pts
The formula for a confidence interval's lower limit is:
Y Answered
M + [tcritical × SEM]
Correct Answer
M - [tcritical × SEM]
s + [tcritical × SEM]
s - [tcritical × SEM]
Question 10
3 / 3 pts
Which of the following is needed to calculate confidence interval's lower
limit?
C !
SEM
SS
each score value
s2
