- Thread starter Anous
- Start date

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,

Alternatively, you may run in R the

The correction options build in the function

You can read about the corrections also in http://www.statskingdom.com/doc_anova.html#bonferroni

I would probably use the Holm

Confidence interval:

http://www.statskingdom.com/40_confidence_interval.html

Or in R:

mean=10

conf_level=0.95

alpha=1-conf_level

s=5

n=18

moe=qt(1-alpha/2,df=n-1)*s/sqrt(n)

mean+moe

mean-moe

Similarly, if you know the standard deviation, not sample SD, use the normal distribution