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WorksheetsT-test Review (Research Design)
Total questions: 25
Worksheet time: 25mins
What is the Mean for the Research Design Students?
(a)
What is the sample standard deviation for the Positive psychology students?
1.41
1.58
1.60
2.88
What is the mean for the positive psychology students?
(a)
What is the population standard deviation for research design students?
1.58
1.41
2.58
1.50
What is the sample standard deviation for research design students?
1.41
1.50
2.88
1.58
What is the sum for research design students?
(a)
What is the sum of squares of positive psychology students?
(a)
What is the sum for positive psychology students?
(a)
What is the population standard deviation for positive psychology students?
7.60
2.88
2.58
1.41
What is the sum of squares for research design students?
(a)
n= ?
10
4
5
.05
What is the researcher's null hypothesis?
MRD ≠ MPos; There is no difference in the number of times one emails between the research design and the positive psychology students
MRD ≠ MPos; There is a difference between the number of times one emails in the research design class versus the amount of times a student in the positive psychology class emails.
MRD = MPos; There is no difference in the number of times one emails between the research design and the positive psychology students
MRD = MPos; There is a difference in the number of times one emails between the research design and the positive psychology students
What is the researcher's alternative hypothesis?
MRD ≠ MPos; There will be a difference in the amount of times one emails between the research design and the positive psychology students.
MRD > MPos; The research design students will check their emails more often than the positive psychology students.
MRD < MPos; The research design students will check their emails less often than the positive psychology students.
The alternative hypothesis is an experimental hypothesis?
True
False
What kind of design does this researcher have?
Independent Groups or Between-Subjects
Non-Equivalent, Quasi-Experimental Design
Matched Design
Repeated Measures Design
What kind of t-test should the experimenter use to analyze the data?
Paired Samples t-test
Dependent Samples t-test
Independent Samples t-test
None of the above
1. Let’s say the researcher ran a t-test on the data, and her results were significant. So, in her write-up of the results, she states that the research design students sent fewer emails on average compared to the positive psychology class and she reports “p < .05.” What does it actually mean when she says that the alpha (p or sig.) value is less than .05?
There is less than a 5% chance that she conducted her analysis correctly.
There is a greater than 5% chance that the differences between her conditions/groups (securely attached vs. anxious/ambivalent attached) were due to chance.
There is less than a 5% chance that the differences between her conditions conditions/groups (research design and positive psychology) were due to chance.
None of the above
As the sample size goes up (i.e., gets larger), the t critical value goes up (i.e., gets larger).
True
False
As the sample size goes up (i.e., gets larger), the t critical value goes down (i.e., gets smaller).
True
False
All else being equal (including df), the absolute value of the two-tailed t critical value is larger than the absolute value of the one-tailed t critical value.
True
False
As alpha value gets smaller (e.g., as it goes from .05 to .01), the t critical value gets smaller.
True
False
What is alpha?
.05
.5
.10
.01
Which two designs do you use a dependent t-test to analyze the data?
Independent groups design
Matched design
Non-equivalent design
Repeated Measures design
What is the correct df formula for an independent t-test?
n1+n2-2
n-1
TRUE or FALSE? When forming a directional hypothesis, you should use a one-tailed test.
True
False
