If the results of an experiment allow one to reject the null hypothesis, then Group of answer choices the control and experimental treatments do not differ significantly with respect to the variable being studied. the experiment lacked adequate controls. too few trials per treatment were performed. the null hypothesis correctly predicts the outcome of the experiment. the control and experimental treatments differ significantly with respect to the variable being studied.
Added by Deanna W.
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If we can reject the null hypothesis, it means there is a significant difference between the control and experimental treatments. Show more…
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A hypothesis test is being used to evaluate a treatment effect with a = .05. If the sample data produce a z-score of z = -2.24, then what is the correct decision? a. Fail to reject the null hypothesis and conclude that the treatment has an effect. b. Fail to reject the null hypothesis and conclude that the treatment has no effect. c. Reject the null hypothesis and conclude that the treatment has no effect. d. Reject the null hypothesis and conclude that the treatment has an effect.
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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? a. Might reject the null hypothesis with α = .05 but might not b. Definitely fail to reject the null hypothesis with either α = .05 or with α = .01 c. Definitely reject the null hypothesis with either α = .05 or with α = .01 d. Definitely reject the null hypothesis with α = .05 and maybe reject with α = .01
Which statement below is correct? Select one: a. The null hypothesis is rejected when the values of the dependent variable for the experimental and control conditions are similar. b. If the data supports the predictions of the experimental hypothesis, it indicates that the experimental hypothesis is definitely true. c. Conclusions may lead to new questions that can inspire further experiments. d. If the experimental hypothesis is rejected, the null hypothesis is also rejected.
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