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In an example study that uses a between participants design...
every participant ate multiple types of pizza
every participant ate a different type of pizza
some participants ate the same type of pizza
every participant ate the same type of pizza
"There is a difference in pizzas eaten between those who are hungry and not hungry" This is a:
non-directional null hypothesis
directional experimental hypothesis
directional null hypothesis
non-directional experimental hypothesis
The null hypothesis tests ...
the probability that there is no difference between groups
systematic variation only
the probability that there is a difference between groups
systematic and unsystematic variation
The aim of null hypothesis testing is ...
to confirm the null hypothesis
to confirm the experimental hypothesis
to falsify the null hypothesis
to falsify the experimental hypothesis
We want the p value (probability) to be ...
as small as possible
as large as possible
A an independent t-test finds a result of p = .038 This result is...
Why would we use effect size in addition to p value?
To make things more complicated
To see if the p value is really significant
To get an indication of 'psychological' significance
To test if there is a significant difference between 2 groups