Class Test Flashcards
What does Cronbach’s alpha need to be over to indicate that you have a reliable measure?
.70
What does the 95% CI actually tell you?
That the true difference between A and B is likely to be within this range 95% of the time if we keep collecting samples of the same size.
If p = .000 how do we write this?
p = < .001
What is this the formula for?
√t2/(t2 + df)
To find the effect size in a paired samples t test.
How do you calculate a Z score?
Score- mean / SD
What is the null hypothesis?
A statement presuming there to be no effect present in the population you are interested in.
A researcher sets their experiment’s statistical power to .90. What percentage of the time can they expect to make a type II error?
10%
If you want to find a small effect instead of a medium effect, what difference will this make to your requires sample size?
It will Increase.
How can you spot an outlier on SPSS?
+/- 3.29
If you don’t have a significant result- what’s important to remember?
DONT report effect size!!!!!!!!
If you have 4 conditions, how many follow up tests do you need to complete?
A v B A v C Av D B v C B v D C v D
6!
What does doing conducting a Bonferroni Correction so?
Ensures you don’t inflate the Type I error rate.
In a correlation:
r2 = .15
What is the effect size?
Medium :)
A primary school teacher wants to know whether the children in his class prefer star charts or extra play time as a reward for good behaviour. To do this, he asks each children to rate how much they enjoy each reward on a 1-5 scale. The scale points are 1 = Not at all, 2 = A little, 3 = OK, 4 = Quite a lot, 5 = A lot.
What test should you use?
Wilcoxon Signed ranks.
