Chi Square Practice Problems Key | PDF | Statistical Significance ... - Free Printable

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- The chi-square test was conducted to determine if light intensity affects aggression in primates.
- Observed frequencies: 40 (low light, no aggression), 60 (low light, aggression), 70 (high light, no aggression), 30 (high light, aggression).
- Expected frequencies under null hypothesis (no effect of light): 55 for each cell.
- Chi-square statistic calculated as Σ[(O-E)²/E] = 0.46.
- Degrees of freedom = 1; critical value at α=0.05 is 3.84.
- Since 0.46 < 3.84, we fail to reject the null hypothesis.
- Conclusion: Light intensity does not have a statistically significant effect on aggression.

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