Chi-squared test Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. What are the degrees of freedom for a test comparing 5 phenotypic classes?
- A. 3
- B. 4
- C. 5
- D. 6
2. A cross gives χ² = 2.1 with a critical value of 7.82. What is the conclusion?
- A. The difference is significant
- B. The null hypothesis is rejected
- C. The difference is not significant
- D. The genes are linked
3. Out of 200 offspring, what is the expected number of the dominant phenotype in a 3 : 1 cross?
- A. 50
- B. 100
- C. 150
- D. 200
4. Which is the correct calculation of χ² for one class?
- A. (O + E)² / E
- B. (O − E)² / E
- C. (O − E) / E²
- D. O² / E
5. Why should the test use counts rather than percentages?
- A. Percentages are always wrong
- B. The test depends on the actual sample size
- C. Counts are easier to add
- D. Percentages give a critical value of 0