. Report means and SD to 1 decimal place, e.g., 35.1
5 of 17
APA test statistics
Report test statistics to 2 decimal places (F, t, R values), e.g., F=3.45
6 of 17
APA p values and effect size
Report p-values and effect sizes to 3 decimal places
7 of 17
normally distributed
1) Look at histograms
2) look at valued of skewness and kurtosis
3) Look at normality tests
8 of 17
skewness and kurtosis
-1.96 <x<1.96 skew or kurtoses
skewness/SE skewness = z skewness
9 of 17
normaility
shapiro wilk greater then 0.05
10 of 17
Independent t - test
between participant / between subject
- can only be in one group i.e smoker non smoker
11 of 17
dependant t test
within participant/ within group
Each participant can be in multiple groups/ conditions
- weight before and after a marathon
12 of 17
reporting dependent t-test
There was a significant difference in performance on the math and reading tests, t(76) = 3.75, p < .001, d = .427. By examining the mean scores it can be seen that performance was significantly higher on the reading (19.5 ± 3.5) (mean plus SD) compared to the math (17.9 ± 3.4) test.
13 of 17
Reporting Independent t- tests
There was no significant difference in the reading performance of smokers and non-smokers, t(75) = 0.21, p = .831, d = .049.
If Levene’s test is significant, report the results for Welch t test instead (not relevant in this example)
14 of 17
Correlations
- assosciation between variables
There is a significant positive correlation between reading test score and house hold income, r(75) = 0.464, p < .001. As household income increases so too does reading test score.
Note DF= N-2
15 of 17
reporting one-way ANOVA
• There was no significant effect of transport used and household income, F (2,74) = 3.02, p =.055, np2= .075.
• Note. As the effect is not significant you do not report post-hoc tests
16 of 17
non parametric equivalents
P - pearson correlation NP - Spearman's Correlation
P - Independent T Test NP- Mann Whitney T-test
P-Dependent T- Test NP- Wilcoxon Signed- Rank Test
P- One- way ANOVA NP- Kruskal Wallis Test
P - One-way Repeated Measures ANOVA NP- Friedman's ANOVA
Comments
No comments have yet been made