Practice Problems

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Chapter 4

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Practice Problems

This activity contains 10 questions.

The conventional levels of significance are:

p < .01, p < .001 p > .01, p > .001 p > .05, p > .01 p < .05, p < .01

	If a researcher conducting a study specifies that eating a hamburger will alter a person’s mood, this hypothesis should be tested using a one-tailed test.

	True False

	If a researcher uses a two-tailed test, the sample score needs to be more extreme in order to be statistically significant than if the researcher had used a one-tailed test.

	True False

	Within the question text below, there is one text entry field where you can enter your answer. The term "p<.01" means that the probability of receiving the results in the study if the hypothesis were true is less than .01 (1%).

You run a study testing a directional hypothesis with a cutoff Z score of -1.64. The sample Z score is 1.82. What do you conclude?

You reject the null hypothesis; the research hypothesis is supported; the result is not statistically significant. The results are inconclusive; the result is statistically significant You reject the null hypothesis; the research hypothesis is supported; the result is statistically significant The results are inconclusive; the result is not statistically significant

	Within the question text below, there is one text entry field where you can enter your answer. You conduct a study with a sample of one case. You use a two-tailed test, with a 5% significance level. Population 2 has a mean of 18 and a standard deviation of 4. The raw score of the sample is 10. The sample's Z score on the comparison distribution is .

	Hypothesis testing is a procedure for determining whether results of an experiment (which studies a population) provide support for a particular theory or practical innovation (which is thought to be applicable to a sample).

	True False

	Within the question text below, there is one text entry field where you can enter your answer. The comparison distribution is the distribution of Population.

	Researchers often choose to use a two-tailed test instead of a one-tailed test, even though they might be interested in an effect in a particular direction, because it allows results opposite to what would be predicted using a one-tailed test to be considered statistically significant.

	True False

Which of the following correctly shows how the results of hypothesis testing might be reported in a research article?

Participants in the experimental condition (M = 25.77, SD = 6.23) completed more puzzles than participants in the control condition (M = 14.23, SD = 5.58), t (100) = 15.87, p < .01. Participants in the experimental condition (M = 25.77, SD = 6.23) completed more puzzles than participants in the control condition (M = 14.23, SD = 5.58), t (100) = 15.87, p = .34. The number of puzzles completed by participants did not differ between the experimental condition (M = 25.77, SD = 6.23) and the control condition (M = 22.13, SD = 7.58), t (100) = 15.87, p < .01. none of the above

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Practice Problems

The conventional levels of significance are:

If a researcher conducting a study specifies that eating a hamburger will alter a person’s mood, this hypothesis should be tested using a one-tailed test.

If a researcher uses a two-tailed test, the sample score needs to be more extreme in order to be statistically significant than if the researcher had used a one-tailed test.

Within the question text below, there is one text entry field where you can enter your answer.

You run a study testing a directional hypothesis with a cutoff Z score of -1.64. The sample Z score is 1.82. What do you conclude?

Within the question text below, there is one text entry field where you can enter your answer.

Hypothesis testing is a procedure for determining whether results of an experiment (which studies a population) provide support for a particular theory or practical innovation (which is thought to be applicable to a sample).

Within the question text below, there is one text entry field where you can enter your answer.

Researchers often choose to use a two-tailed test instead of a one-tailed test, even though they might be interested in an effect in a particular direction, because it allows results opposite to what would be predicted using a one-tailed test to be considered statistically significant.

Which of the following correctly shows how the results of hypothesis testing might be reported in a research article?