Presentation Transcript
The chi-square test :The chi-square test By: Amparo Acevedo
Objective :Objective Interpret the results of a chi-square test using a probability table
Chi-square value at probability P :Chi-square value at probability P
Interpretation :Interpretation If 0.90> (P of X.X)>0.10, detector is Ok
If (P of X.X)>0.90, the detector shows too little variation
If (P of X.X.)<0.10, the detector exhibits too much variation
Questions :Questions What is the acceptable range for a sample of 15?
Slide 6:For a sample of 15 the acceptable range is between 7.79 and 21.1
Slide 7:In what range the detector shows no variation?
Slide 8:0.90> (P of X.X)> 0.10
Slide 9:For a sample measurements of 20 what is the largest acceptable variation?
Slide 10:27.2
Slide 11:In what range the detector shows little variation?
Slide 12:(P of X.X)>0.90
Slide 13:In what range the detector shows too much variation?
Slide 14:(P of X.X)<0.10