Question 1
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 2
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 increa
ses
Question 3
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 4
2 out of 2 points
A histogram is used for what purpose when conducting an independent
samples t test?
Selected
Answer:
The normality
assumption
Question 5
2 out of 2 points
A researcher reports that the η2 effect size for her study is very large (η2 = .64); but
the t test that she reports is quite small, and not statistically significant. What
inference can you make about this situation?
Selected
Answer:
the n's in the groups are probably
rather small
Question 6
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 7
2 out of 2 points
Based on these results, t(90)= 1.87, p= .07, n2 = .13, what can the educational
researcher say about the null hypothesis?
Selected
Answer:
Fail to reject the null
hypothesis
Question 8
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:
rp
b
Question 9
2 out of 2 points
The F (Levene) test on the SPSS output tests for what assumption?
Selected
Answer:
The homogeneity of variance
assumption
Question 10
2 out of 2 points
Based on these results, t (92) = -.67, p = .001, d = .56. The reading scores of males
(M = 31.54, SD = 5.16, n = 29) on 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 score statistically
significantly lower than females (M = 32.46, SD = 4.96, n = 65) in
terms of reading achievement.
Question 11
2 out of 2 points
Based on these results, t(90)= 3.66, p= .04, η2 = .25, what can the educational
researcher say about the null hypothesis?
Selected
Answer:
Reject the null
hypothesis
Question 12
2 out of 2 points
If the Levene test is statistically significant,
Selected
Answer:
the variances are considered
unequal.
Question 13
2 out of 2 points
Based on these results, t (92) = -.67, p = .41, d = -.10. The math scores of males (M =
31.54, SD = 5.16, n = 29) on 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 math achievement
Question 14
2 out of 2 points
What would be the minimum sample size for an independent sample t-test for medium effect
size were eta squared = .03, alpha = .05, and statistical power equals .80?
Selected
Answer:
12
8
Answer
Feedback:
14
6
Question 15
2 out of 2 points
Interpret the effect size (η2) for: t(34) = 2.62, p= .04, η2 = .01
Selected
Answer:
Sma
ll
Sunday, September 1, 2019 2:12:39 PM EDT
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