Research Class - Exam 2
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33 Terms
What is descriptive statistics?
Statistics that describe the data
What are some examples of descriptive statistics?
mean, median, range, standard deviation
What is inferential statictics?
Statistics that make an inference about the probability related to the data
What are some examples of inferential statistics?
t-tests, ANOVA, correlations
What is statistical significance usually set at and what does that mean?
p < 0.05 and it means that you have a <5% change you are saying there is a difference when there is NOT a difference
Why do we need to make inferences?
-There is variability in the data
-We cannot predict with absolute certainty that means between two groups of participants are different because there is variation in performance within each group.
What 2 questions can help you figure out what inferential statistic you should use?
What is your research question?
How many groups do you have?
What are the types of research questions?
Correlation questions
Difference questions
What is a correlation question?
Is there a relation/association/correlation between variable 1 and variable 2
What is a difference question?
Is there a difference between groups?
Is there a difference between pretest and posttest?
Is there a difference between multiple time point?
What statistic would you use for a relation/association question?
Pearson’s correlation
Positive correlation
When one variable increases, the other variable increases too
It is not perfect and isn’t necessarily on the line
Negative correlation
When one variable decreases, the other variable does too
When two group are independent, what statistic do you use?
Independent T-test
When two groups are related, what statistic do you use?
Paired t-test
If you are comparing a control group to a treatment group, what statistic is this?
Independent T-test
Paired T-test
You want to measure the same group twice for example at pretest/posttest
OR you want to measure groups that are matched
When there are three or more groups that are independent, what stati