Question 189125
A coin was flipped 60 times and came up heads 38 times. 
(a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. 
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Ho: p = 1/2
Ho: p > 1/2
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sample proportion: 38/60 = 0.6333
test statistic: z(0.6333) = (0.6333-0.5)/sqrt[(.5*.5/60] = 2.0656
(b) Calculate a p-value and interpret it.
p-value = P(z > 2.0656) = 0.0194
This means the probability of a test providing stronger evidence
for rejecting Ho is 1.094%
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Conclusion: Since the p-value is less than alpha = 10%, reject Ho.
The coin is biased toward heads.
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Cheers,
Stan H.