Using the Chi-Squared Test (OCR A-Level Biology A): Quizzes
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Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What type of data can the chi-squared test be applied to?
What type of data can the chi-squared test be applied to?
Categorical data in distinct groups
What does the null hypothesis assume about observed vs expected results?
What does the null hypothesis assume about observed vs expected results?
No significant difference exists
If 480 offspring follow a 3:1 ratio, what is the expected value for the dominant phenotype?
If 480 offspring follow a 3:1 ratio, what is the expected value for the dominant phenotype?
360
In the formula χ² = Σ(O-E)²/E, what does the Σ symbol represent?
In the formula χ² = Σ(O-E)²/E, what does the Σ symbol represent?
Sum of all category values
How do you calculate degrees of freedom for a chi-squared test?
How do you calculate degrees of freedom for a chi-squared test?
n - 1 (n = number of categories)
What is the standard significance level used in biology for chi-squared tests?
What is the standard significance level used in biology for chi-squared tests?
p = 0.05 (5%)
If calculated χ² is 3.23 and critical value is 7.82, what should you conclude?
If calculated χ² is 3.23 and critical value is 7.82, what should you conclude?
Accept null hypothesis
What ratio is expected for a dihybrid test cross with unlinked genes?
What ratio is expected for a dihybrid test cross with unlinked genes?
1:1:1:1
What phenotypic pattern suggests genes are linked on the same chromosome?
What phenotypic pattern suggests genes are linked on the same chromosome?
Two large & two small classes
If χ² = 181.83 with critical value 7.82, what biological conclusion follows?
If χ² = 181.83 with critical value 7.82, what biological conclusion follows?
Genes are linked, not independent