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Lecture 4

PSY202H1 Lecture Notes - Lecture 4: Analysis Of Variance, Negative Number


Department
Psychology
Course Code
PSY202H1
Professor
Amanda
Lecture
4

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Does amount of sleep (4 hours vs 8 hours) influence test performance for older, but not
younger, adults? All data were collected in a single day.
There are 2 variables:
Hours of sleeps
Age of adults
Because all the data were collected in a single day, therefore there are different participants in
each group, it has to be between subjects.
ANS:
-Factorial independent-measures ANOVA
Do students perform better the second time they do a task than the first time they do a task,
but only if the task is easy, and not difficult? Participants perform either an easy or difficult
task.
Variables:
Difficult task or easy task
Factorial mixed design ANOVA
(mixed means that there are both independent and repeated I the study)
Is there a difference in test performance between high school students who study for less than
5 hours, between 5-10 hours, and more than 10 hours?
One-way independent-measures ANOVA
Do young adults prefer coffee over doughnuts in the morning, but doughnuts over coffee in the
evening? Participants are given a coffee and doughnut one morning and are given a coffee and
doughnut the following evening.
Type of food, and timing are the 2 variables.
Factorial repeated-measures ANOVA
Correlation
Allows us to measure and describe the relationship between 2 continuous variables.
The more consistent relationship the larger the number is like -0.8. no matter if it is positive or
negative.
Transforming the data
If we add or subtract every X or Y to a number, it will just shift the graph instead of changing
the shape of the data.
But when we are multiplying or divide X or Y with negative number, it will be changing the
correlation.
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