A student wants to determine if pennies are really fair, meaning equally likely to land heads up or tails up. He flips a random sample of 50 pennies and finds that 28 of them land heads up. What are the appropriate null and alternative hypotheses?
a. H0: p ? 0.5, Ha : p < 0.5
b. H0: p ? 0.5, Ha : p ? 0.5
c. H0: p = 0.5, Ha : p > 0.5
d. H0: p ? 28, Ha : p < 28
c
RATIONALE: The appropriate null and alternative hypotheses are H0 : p = 0.5, Ha : p ? 0.5 . This is equivalent to saying "pennies are fair" vs "pennies are not fair".
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