Test 1 Flashcards
Types of error bars
SD, SEM, 95% Cl
Conclusion if SD overlaps/ doesn’t overlap?
No conclusion/ no conclusion
Conclusion if SEM (standard error) overlaps/ doesn’t overlap?
Not statistically significant to be different / no conclusion
Conclusion if 95% CI (confidence interval) overlaps/ doesn’t overlap?
No conclusion/ statistically more likely to be different
What is standard deviation
Approximate mean of differences between data points and overall mean
What is standard error
Estimate of the expected variability of the mean
What is confidence interval
Range of values in which the true mean can be expected
If two mean error bars overlap:
The difference between the two samples is not statistically significant
When is a t-test used?
When there is a dependent and independent variable. It tells us how significant the difference between group means are
If t / X2 value is lower than critical value,
The hypothesis is not rejected
If t / X2 value is higher than critical value,
Hypothesis rejected
How to determine degree of freedom for t testing
n1+n2 -2
How to use the 2-tail test
Find row with the right degree of freedom and the column with 95% for the 2-tail confidence level.
-Find the corresponding critical value
— check if t value higher or lower
How to calculate expected outcome
(Criteria 1/total number) x (criteria 2)
Degree of freedom calculation for X2 testing?
Df =N-1
