Posted by Anonymous on Tuesday, July 13, 2010 at 7:57pm.
What type of data must you collect to conduct a ttest? Why?

statistics  PsyDAG, Wednesday, July 14, 2010 at 3:18pm
ttest is similar to Z, but uses a correction to make up for smaller size of a sample, especially less than 30. With smaller samples, they are less likely to be normally distributed.

statistics  Anonymous, Friday, July 16, 2010 at 1:14pm
Can you send me to the right website to find information on ttest and the data that is used? Please. Thank you.