Test question
For a statistically significant result for a t-test, we want:
Group of answer choices
pcalc to be less than pcrit
tcalc to be less than tcrit (in absolute value)
pcalc to be greater than pcrit
none of the above
Flag question: Question 2
Question 20.67 pts
If you commit a Type II error, you are also doing what? (Select the best answer)
Group of answer choices
You are rejecting the null.
You are accepting the null.
You are finding something that is not there in reality.
You are not finding something when in reality something is there.
Flag question: Question 3
Question 30.67 pts
Use the following scenario to answer the next 3 questions. Because you think highly of Texas Woman’s University, you are considering a study in which you would examine if TWU graduate students are smarter (in terms of IQ) than people in general. Which type of statistical test would be most appropriate to answer your research question?
Group of answer choices
Pearson r
Chi-square
single sample t-test
independent samples t-test
Flag question: Question 4
Question 40.67 pts
What sample size would be best for your study?
Group of answer choices
10
20
30
40
50
Flag question: Question 5
Question 50.67 pts
Your null hypothesis (H0) would be tested with a:
Group of answer choices
one-tailed test
two-tailed test
none of the above
Flag question: Question 6
Question 60.67 pts
Which of the following differences between two means is least likely to be statistically significant (assuming the variances of all groups are equal and each difference is tested using the same alpha)?
(1) M1 – M2 = 2.47 and n = 10 for both groups.
(2) M1 – M2 = 2.47 and n = 20 for both groups.
(3) M1 – M2 = 2.47 and n = 30 for both groups.
(4) M1 – M2 = 2.47 and n = 40 for both groups.
Group of answer choices
(1)
(2)
(3)
(4)
Flag question: Question 7
Question 70.67 pts
Use the following scenario to answer the next 3 questions.
Assume you conducted a study to compare whether males scored lower than females on a test of extroversion. (Your theory is that females tend to be more extroverted than males.) You conduct an appropriate statistical significance test with a total sample size of 28 and equal group sizes. Assume an alpha level of .01.
What is the appropriate analysis for this example?
Group of answer choices
dependent samples t-test
independent samples t-test
single sample t-test
none of the above
Flag question: Question 8
Question 80.67 pts
Your null hypothesis (H0) would be tested with a:
Group of answer choices
one-tailed test
two-tailed test
none of the above
Flag question: Question 9
Question 90.67 pts
Assuming tcalc was 2.437, what was your decision concerning the null hypothesis and statistical significance in this case?
Group of answer choices
Fail to reject the null because your results WERE statistically significant.
Fail to reject the null because your results WERE NOT statistically significant.
Reject the null because your results WERE statistically significant.
Reject the null because your results WERE NOT statistically significant.
Flag question: Question 10
Question 100.67 pts
The median of the scores 1, 4, 6, 4, 2, 4, 7, 8, 8, 9, and 10 is
Group of answer choices
4
5.7
6
8
Flag question: Question 11
Question 110.67 pts
If the variance is 9, then the standard deviation is
Group of answer choices
18
81
3
4.5
Flag question: Question 12
Question 120.67 pts
The degree to which the the two populations of individual scores are different from each other is
Group of answer choices
power
the significance level
the effect size
Flag question: Question 13
Question 130.67 pts
A t test for dependent means would be used to compare
Group of answer choices
the level of honesty in politicians with the level of honesty in students.
the level of reading comprehension of students at the beginning and at the end of a speed-reading class.
the hours spent studying each week by freshmen and seniors.
the scores on a tolerance-of-diversity measure between two sororities.
Flag question: Question 14
Question 140.67 pts
In which of the following situations would a t test for independent means be conducted?
Group of answer choices
a comparison of the SAT scores of a group of 10 students who completed a special SAT preparation course compared to the scores of students in general on the SAT
a comparison of scores of participants in a memory study in which one group is assigned to learn the words in alphabetical order and another group is assigned to read the words in order of length of the word
a comparison of participants’ scores on a skills test before and after attending a training session intended to improve the skill
None of the situations above is suitable for a t test for independent means
Flag question: Question 15
Question 150.67 pts
We are testing a new treatment for depression (continuous). One group gets the treatment and the other group gets no treatment (Control group). Which significance test should we use?
Group of answer choices
single sample t-test
dependent samples t-test
independent samples t-test
Chi-square test
Flag question: Question 16
Question 160.67 pts
I want to compare the happiness of educational psychology statistics students at TWU to ALL college students. I have the mean and SD happiness of my sample, and the mean for all college students. Which significance test should I use?
Group of answer choices
Z-test
single sample t-test
independent samples t-test
dependent samples t-test
Flag question: Question 17
Question 170.67 pts
Which scenario best fits a dependent samples t-test?
Group of answer choices
A study comparing pretest and post-test scores on the same variable
Using PTSD scores to predict depression
Using PTSD and insomnia scores to predict depression
Flag question: Question 18
Question 180.67 pts
Which significance test should be used to see if my samples time 2 scores are higher than their time 1 scores?
