Exam 8: Introduction to Hypothesis Testing.

A researcher administers a treatment to a sample of participants selected from a population with µ = 80.If the researcher obtains a sample mean of M = 88,which combination of factors is most likely to result in rejecting the null hypothesis?

The null hypothesis predicts a specific value for the population mean.

If a hypothesis test is found to have power = 0.70,what is the probability that the test will result in a Type II error?

The power of a hypothesis test is the probability that the sample mean will be in the critical region even if the treatment has no effect.

If a hypothesis test rejects the null hypothesis using an alpha level of α = .05,then the research report would include the statement,"p > .05."

A researcher administers a treatment to a sample of participants selected from a population with µ = 80.If a hypothesis test is used to evaluate the effect of the treatment,which combination of factors is most likely to result in rejecting the null hypothesis?

What is the consequence of a Type I error?

A researcher is conducting an experiment to evaluate a treatment that is expected to increase the scores for individuals in a population.If the researcher uses a one-tailed test with α = .01,then which of the following correctly identifies the critical region?

A researcher selects a sample of n = 25 from a normal population with µ = 40 and σ = 10.If the treatment is expected to increase scores by 3 points,what is the power of a two-tailed hypothesis test using α = .05?

Which of the following accurately describes the critical region?

In a research report,the term significant result means that the null hypothesis was rejected.

A researcher evaluates a treatment effect using a one-tailed hypothesis test with α = .05,and the decision is to reject the null hypothesis.If the researcher switched to a two-tailed test using the same sample,what decision would be made?

In general,the null hypothesis states that the treatment has no effect on the population mean.

A researcher evaluates a treatment effect using a two-tailed hypothesis test with α = .05,and the decision is to reject the null hypothesis.If the researcher used the same sample and switched to a one-tailed test that is consistent with the direction found in initial two-tailed hypothesis test,what decision would be made?

Although the size of the sample can influence the outcome of a hypothesis test,it has little or no influence on measures of effect size.

For a hypothesis test evaluating the effect of a treatment on a population mean,what basic assumption is made concerning the treatment effect?

When is there a risk of a Type I error?

Which of the following is an accurate definition of a Type I error?

If a hypothesis test leads to rejecting the null hypothesis,it means that the sample data failed to provide sufficient evidence to conclude that the treatment has an effect.

A researcher conducts a hypothesis test to evaluate the effect of a treatment.The hypothesis test produces a z-score of z = 2.37.Assuming that the researcher is using a two-tailed test,what decision should be made?