Which of the following accurately describes a hypothesis test?
answer
An inferential technique that uses the data from a sample to draw inferences about a population
question
What is measured by the numerator of the z-score test statistic?
answer
The actual distance between M and mu
question
For a hypothesis test evaluating the effect of a treatment on a population mean, what basic assumption is made concerning the treatment effect?
answer
If there is a treatment effect, it will add/subtract a constant to each score
question
A researcher selects a sample and administers a treatment to the individuals in the sample. If the sample is used for a hypothesis test, what does the null hypothesis (H0) say about the treatment?
answer
The treatment has no effect on the scores
question
Which of the following accurately describes the critical region?
answer
Outcomes with a very low probability if the null hypothesis is true.
question
If a hypothesis test produces a z-score in the critical region, what decision should be made?
answer
Reject the null hypothesis
question
The critical boundaries for a hypothesis test are z=+1.96/-1.96. If the z-score for the sample data is z=-1.90, what is the correct statistical decision?
answer
Fail to reject the null hypotheis
question
A researcher administers a treatment to a sample of participants selected from a population with a population mean of 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?
answer
A sample mean much different than 80 for a large sample
question
A researcher administers a treatment to a sample of participants selected from a population with a population mean of 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?
answer
standard deviation of 5, alpha =.05
question
A researcher is conducting an experiment to evaluate a treatment that is expected to increase the scores for individuals in a population that is known to have a mean of 80. The results will be examined using a one-tailed hypothesis test. Which of the following is the correct statement of the null hypothesis?
answer
mu is less than or equal to 80
Mu < 80
-
question
A researcher expects a treatment to increase the scores for individuals in a population. The treatment is evaluated using a one-tailed hypothesis test, and the test produces z=+2.40. Based on this result, what is the correct statistical decision?
answer
The researcher should reject the null hypothesis with either alpha=.05 or .01
question
A researcher evaluates a treatment effect using a two-tailed hypothesis test with alpha=.05, and the decision is to reject the null hypothesis. If the researcher switched to a one-tailed test using the same sample, what decision would be made?
answer
Definitely reject the null hypothesis with alpha=.05 and maybe reject alpha=.01
question
A hypothesis test involves a comparison of which two elements?
answer
Research results from a sample and a hypothesis about a population
question
What is measured by the denominator of the z-score test statistic?
answer
The average distance between M and mu that would be expected if H0 was true
question
Which of the following is directly addressed by the null hypothesis?
answer
The population after treatment
question
A researcher selects a sample and administers a treatment to the individuals in the sample. If the sample is used for a hypothesis test, what does the alternative hypothesis (H1) say about the treatment?
answer
The treatment causes a change in the scores
question
With alpha=.05, how are the boundaries for the critical region determined>
answer
Boundaries are drawn so there is 2.5% (.025) in each tail of the distribution
question
A two-tailed hypothesis is being used to evaluate a treatment effect with alpha=.05. If the sample data produce a z-score of z=-2.24, what is the correct decision?
answer
Reject the null hypothesis and conclude that that the treatment has an effect
question
A two-tailed hypothesis test is being used to evaluate a treatment effect. The hypothesis test produces a z-score of 2.37. Assuming that the researcher is using a two-tailed test, what decision should be made?
answer
The researcher should reject the null hypothesis with a alpha =0.05 but not with an alpha= 0.01
question
A researcher administers a treatment to a sample of participants selected from a population with a mean of 80. If the researcher obtains a sample mean of 88, which combination of factors is most likely to result in rejecting the null hypothesis?
answer
A sample mean much different than 8- with alpha = 0.05
question
A researcher administers a treatment to a sample of participants selected from a population with a mean of 80. If the researcher obtains a sample mean of 88, which combination of factors is most likely to result in rejecting the null hypothesis?
answer
standard deviation = 5, n = 50
question
A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to increase scores. The hypothesis test produces a z-score of 2.27. If the researcher is using a one tailed test with alpha = 0.01, then which of the following correctly identifies the critical region?
answer
z>2.33
question
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 alpha = 0.01, then which of the following correctly identifies the critical region?
answer
z>2.33
question
A researcher evaluates a treatment effect using a one-tailed hypothesis test with alpha = 0.05, 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?
answer
Might reject the null hypothesis with alpha = 0.05 but might not
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