PBSI 301 Exam II Review

When the p-value is less than the alpha level (e.g., 0.05), what should you do?

• Fail to reject the null hypothesis

• Reject the null hypothesis

• Accept the alternative hypothesis

• Fail to accept the alternative hypothesis

A Type I error occurs when:

• A true null hypothesis is rejected

• A false null hypothesis is rejected

• A true null hypothesis is accepted

• A false null hypothesis is accepted

A two-tailed test is appropriate when:

• The research hypothesis predicts a specific direction of the effect

• The research hypothesis predicts no difference between groups

• The research hypothesis predicts that the effect could occur in either direction

• The research hypothesis predicts a stronger effect in one group than the other

Which of the following would suggest that a result is statistically significant?

• A p=value greater than 0.05

• A large confidence interval

• A large sample size

• A p-value less than 0.05

If a test statistic falls within the critical region of a two-tailed test, what conclusion should be drawn?

• Fail to reject the null hypothesis

• Reject the null hypothesis

• Fail to accept the null hypothesis

• Increase the sample size and recalculate

In hypothesis testing, what does a 95% confidence interval mean?

• There is a 95% probability that the sample mean is equal to the population mean

• There is a 95% probability that the null hypothesis is true

• There is a 95% probability that the population parameter lies within the interval

• There is a 5% probability that the null hypothesis is rejected

Which of the following is true about a normal distribution?

• It's skewed to the right

• It's skewed to the left

• It has multiple peaks and is asymmetrical

• It has a single peak, and is symmetrical

Increasing the sample size reduces the likelihood of committing a Type II error

• True

• False

If the alpha level is set to 0.01, the researcher is willing to take a 1% risk of rejecting a true null hypothesis

• True

• False

When the p-value is larger than the alpha level, the null hypothesis is rejected

• True

• False