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Lecture 4

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

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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.
-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
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
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
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
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