A coin tossed 50 times gives 30 heads and 20 tails. What is the chi-square statistic for testing fairness?
Correct answer C. 2.0
Explanation
Expected counts are 25 each. χ² = (30 − 25)²/25 + (20 − 25)²/25 = 1 + 1 = 2.0.
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