Interential Testing Flashcards
What is a statistical test
Determine whether the results of an experiment is significant statistically
When carrying out a statistical test the probability level is
5%
Meaning there is only 5% chance that the result were due to chance
When comparing the calculated/ observed value and critical value
The observed value must be greater than or lower than the critical value to be significant
What is type 1 error
The alternative hypothesis is mistakenly accepted
Says there is a significant difference between the groups but in reality there isn’t
This is likely when the significance level is too lenient for example 10%
What is type II error
Null hypothesis is mistakenly accepted
Says there is no significant difference when there is
Usually when the significance level is too strict for example 1%
Choosing a statistical test
Difference or correlation
Related (repeated measures or match pairs) or unrelated design (independent measures)
Nominal or ordinal or interval
Probability/ significance level
Explain what is meant by significance at p<0.05
95% confidence
How to carry out a sign test
Data converted to nominal data = substrate result from condition 2 from condition 1
Plus and minuses are added up
Get the total plus and minus
Sum of less frequent sign is used as S
The calculated value S is compared to critical value
Tests of difference
Asked about most
Man Whitney
Wilcoxon
What is man Whitney
Difference
Independent group design
Ordinal data
Wilcoxon
Difference
Repeated measures
Ordinal data
Parametric test of difference
Unrelated t-test
Related t-test
Unrelated t-test
Difference
Independent group design
Interval data
Related t-test
Difference
Repeated measures design
Interval data
Tests of correlation
Spearman’s Rho
Pearson’s R
What is spearman’s Rho
Correlation
Ordinal or (interval)
Pearson’s R
Correlation
Interval level
Test of association
Chi2
Chi-squared
Association
Norminal level
