Homework Answers
Ans:
Total observations=27+19+18+20=84
Expected count for each day=84/4=21
| Day | Observed(fo) | Expected(fe) | (fo-fe)^2/fe |
| Monday | 27 | 21 | 1.714 |
| Tuesday | 19 | 21 | 0.190 |
| Wednesday | 18 | 21 | 0.429 |
| Friday | 20 | 21 | 0.048 |
| Total | 84 | 84 | 2.381 |
Chi square test statistic=2.381
df=4-1=3
p-value=CHIDIST(2.381,3)=0.4972
As,p-value>0.1,we fail to reject the null hypothesis.
There is not sufficient evidence to support the belief that number of students who are absent varies from day to day.
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