Chi-squared Class Notes
| Observed | Expected | ==(o-e)^2 /e== | |
|---|---|---|---|
| Dry | 22.55 | 27 | 0.73 |
| Wet | 31.45 | 27 | 0.73 |
| Total x | 1.46 |
Observed is the expected results
==(o-e)^2 /e= 0.73==
==OUR LAB:==
Add up all 3 trials
Find Averages
Expected 15 on both sides
==Degrees of freedom are equal to the number of distinct possible outcomes minus 1==
df=2-1=1
critical value 3.84
If o-e is smaller than the difference between the 2 groups means the more similar they are
x^2= 1.46<_3.84
there is NOT A STATISTICAL DIFFERENCE
p value is the confidence level