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Proportion Testing with Z test

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What is the alternative hypothesis consistent with the claim the test subject is an expert?

Which of the following is consistent with the rule for the null hypothesis and with the alternative:

H0: p < 0.5
H0: p > 0.5
H0: p = 0.5
H0: p ? ?? 0.5

Why 0.5?

What is the critical value for the test statistic?

What is the decision rule to reject H0?

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