The research question is: How does grammatical complexity affect the acquisition order of conditional types?
Attached are the mean scores of the diffrent conditional types.
How can I use the significance correction?
How can I calculate a confidence interval per each?
Is it research or assignment? say do you have the data or only the averages/standard deviations?
Are SD known SD? or sample SD?
Do you have to do it with SPSS?
If you have the data, you can use one-way Anova with Tukey HSD :
The Anova will answer the default assumption that all averages are equal, and the Tukey the order: http://www.statskingdom.com/180Anova1way.html, includes Tukey HSD, You will also get the R code so you could then run on R if you prefer.
If you use Tukey HSD you don't need to do correction,