Question 1
2 out of 2 points
What would be the minimum sample size for an independent samples t-test with
a small effect size where eta squared = .01, alpha = .05, and statistical power
= .70?
Selected
Answers:
31
0
Question 2
2 out of 2 points
If variances are unequal, which would be an alternate non-parametric test for the
independent samples t test?
Selected
Answer: Wilcoxon rank sum test
Question 3
2 out of 2 points
The Kolmogorov-Smirnov tests for what assumption?
Selected
Answer:
The normality
assumption
Question 4
2 out of 2 points
In most educational research, if p < .05 then you should:
Selected
Answer:
Reject the
null
Question 5
2 out of 2 points
A researcher plans to do a study to see whether people who eat an all carbohydrate diet
have different cholesterol levels than people in the general public.
The dependent variable in this study is:
Selected
Answer:
cholesterol levels.
Question 6
2 out of 2 points
An independent samples t-test is appropriate for measuring differences between
a selected sample and a population with a mean that is already known.
Selected
Answer:
Fals
e
Question 7
2 out of 2 points
The independent-samples t-test is used to determine if there is a difference
between the means of two unrelated groups on the same continuous dependent
variable.
Selected
Answer:
Tru
e
Question 8
2 out of 2 points
If the Levene's test is statistically significant, then:
Selected
Answer:
the assumption of equal varience is
considered not met.
Question 9
2 out of 2 points
Based on these results, t(20) = 2.03, p = .06, n2 = .13, what can the educational
researcher say about the null hypothesis?
Selected
Answer:
Fail to reject the null
hypothesis
Question 10
2 out of 2 points
A researcher plans to do a study to see whether people who eat an all carbohydrate meal
have different scores on a mood scale than people who eat an all protein meal. Thus, the
manipulated independent variable is the type of meal (1 = carbohydrate, 2 = protein). What
analysis would be the best choice to analyze the data?
Selected
Answer:
independent samples t-
test
Question 11
2 out of 2 points
A researcher plans to do a study to see whether people who exercise every
day have different blood pressure as compared to blood pressure of people who
are in the general population. Thus, the independent variable is exercise and the
dependent variable is blood pressure. What analysis would be the best choice to
analyze the data?
Selected
Answer:
one-sample t-
test
Question 12
2 out of 2 points
The minimum sample size for an independent samples t-test with a medium
effect size where eta squared = .05, alpha = .05, and statistical power = .
80 would be 76 participants.
Selected
Answer:
Tru
e
Question 13
2 out of 2 points
When conducting an independent samples t-test, the assumption for Normality is tested
using:
Selected
Answer: Shapiro-Wilks or Kolmogorov-Smirnov
Question 14
2 out of 2 points
It the absolute value of a t-statistic is greater than t-critical then you should:
Selected
Answer:
Reject the null
Question 15
2 out of 2 points
If the alpha level is .05, then the confidence level is:
Selected
Answer:
95
%
Question 16
2 out of 2 points
The results of a study that used an independent samples t-test was t(28) =
2.14, p = .01. Based on these results, what was the sample size?
Selected
Answer:
3
0
Question 17
2 out of 2 points
Based on these results, t(40)= 1.59, p = .24, η2 = .002, what can the educational
researcher say about the null hypothesis?
Selected
Answer:
Fail to reject the null
hypothesis
Question 18
2 out of 2 points
If all other values are held constant, what happens to the value of t when sample
size increases:
Selected
Answer:
t increas
es
Question 19
2 out of 2 points
Which of the following is not a measure of effect size used for
an independent samples t-test?
Selected
Answer:
F-
critical
Question 20
2 out of 2 points
Eta square can be calculated using the formula η2 = t2/(t2 + df).
Selected
Answer:
Tru
e
Question 21
2 out of 2 points
When using an independent samples t-test, the author of
a journal article reported that t(30) = 3.60, p < .05. Should the researcher reject
the null or fail to reject the null?
Selected
Answer:
reject the null
Question 22
2 out of 2 points
Interpret the effect size (η2) for the following: t(30) = 1.12, p = .34, η2 = .001
Selected
Answer:
Sma
ll
Question 23
2 out of 2 points
Interpret the effect size (n2) for the following: t(90)= 4.06, p = .001, n2 = .11
Selected
Answer:
Larg
e
Question 24
2 out of 2 points
Based on these results, t(60) = -1.67, p = .11, the reading scores of males (M =
31.54, SD = 5.16, n = 29) and females were compared (M = 32.46, SD =
4.96, n = 65). What can be concluded based on these results?
Selected
Answer:
Males (M = 31.54, SD = 5.16, n = 29) on average do not statistically
significantly differ from females (M = 32.46, SD = 4.96, n = 65) in
terms of reading achievement
Question 25
2 out of 2 points
When looking for extreme outliers using a box and whisker plot, the extreme
outliers will have an asterisk (*) next to the data point.
Selected
Answer:
Tru
e
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