AP Statistics Chapter 9

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Identify the correct null hypothesis:

Is the proportion of babies born male different from 50%? In a sample of 200 babies, 96 were male. Test the claim using a level of significance of 1%.

• H₀: p = 0.50

• H₀: µ = 100

• H₀: p = 0.48

• H₀: µ = 96

Which type of error occurs if we reject a true null hypothesis?

• Type I Error

• Type II Error

• Sampling Error

• Non-sampling Error

If a test of hypothesis has a significance level of 0.05, which p-value would lead to the rejection of the null hypothesis?

• 0.07

• 0.05

• 0.03

• 0.10

In a left-tailed test, the test statistic is -2.5 and the critical value is -1.96. What is the correct decision regarding the null hypothesis?

• Fail to reject the null hypothesis.

• Reject the null hypothesis.

• Accept the null hypothesis.

• There is not enough information to make a decision.

In testing hypotheses, which of the following would be strong evidence against the null hypothesis?

• using a small level of significance

• using a large level of significance

• obtaining data with a small p-value

• obtaining data with a low test statistic

Which of the following shows a right-tailed test?

• Ha: p < .15

• H₀: p < .15

• Ha: p > .15

• H₀: p > .15

When p-value is less than alpha we:

• Reject Ho

• Fail to reject Ha

• Fail to reject Ho

• Reject Ha

Suppose the P-value for a hypothesis test is 0.0304. Using α = 0.05, what is the appropriate conclusion?

• Reject the null hypothesis

• Reject the alternative hypothesis

• Fail to reject the null hypothesis

• Fail to reject the alternative hypothesis