Homework Answers
| Class Interval | Observed f | Expected frequency (as per normal distribution) | (Observed - Expected)^2 /Expected |
| < 50 | 0 | 2.709013277 | 2.709013277 |
| 50-60 | 11 | 3.760910141 | 13.93397343 |
| 60-70 | 4 | 5.443734921 | 0.382893464 |
| 70-80 | 1 | 5.629843677 | 3.807468502 |
| 80-90 | 3 | 4.160025961 | 0.323473998 |
| 90-98 | 6 | 1.893557736 | 8.905388914 |
| >= 98 | 0 | 1.402914287 | 1.402914287 |
| chi-square value = | 31.46512588 |
| Hypotheses: | ||
| Ho: The population has a normal distribution | ||
| Ha: The population does not have a normal distribution | ||
Test statistic = 31.47
p- value = Less than 0.005
Conclusion: The data does not come from a normal distribution
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