2. t Test Assumptions: Paired/dependent/matched Samples:
two matched or paired samples
data from populations are assumed to approximate a normal distribution
Variance for both samples are approximately equal
Observations must be independent of each other
outliers
Max value
75th percentile
Median
25th percentile
Min value

3. One-tailed vs. Two-tailed test of significance.
With a two-tailed test of significance (at the .05 level), the alpha is split so that both directions can be covered.
With a one-tailed test of significance the alpha is not split and is applied to one direction – with a one-tailed test you are testing for significance in one direction and disregarding the possibility of significance in the other direction. The one-tailed test is more likely (more powerful) in finding significance.

8. Group A – McDonald’s Coffee
Within Group Variance
Sampling Error Variance
Mean

9. Group B – Tim Horton’s Coffee
Within Group Variance
Sampling Error Variance
Mean

10. Group A – McDonald’s Coffee
Group B – Tim Horton’s Coffee
Mean
Mean

11. Group B – Tim Horton’s Coffee
Group A – McDonald’s Coffee
Mean
Mean
Between Group Variance

17. http://www. youtube. com/watch