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Exam 7: Inferences About the Difference Between Two Means

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Exam 1: Introduction9 Questionsadd course
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Review the following SPSS output. Interpret the output including identifying the specific statistical procedure that has been used and reporting the extent to which the test is statistically significant. Include appropriate evidence (e.g., test statistic value, degrees of freedom, and p value). Review the following SPSS output. Interpret the output including identifying the specific statistical procedure that has been used and reporting the extent to which the test is statistically significant. Include appropriate evidence (e.g., test statistic value, degrees of freedom, and p value).

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A dependent t test (i.e., paired samples test) was conducted. The test is statistically significant, t = -7.283, df = 9, p = .000.

Calculate and interpret Cohen's d using the following output. Calculate and interpret Cohen's d using the following output.

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The effect size is computed to be the following:
 Cohen d=dˉsd=−27.6011.98=2.30\text { Cohen } d=\frac{\bar{d}}{s_{d}}=\frac{-27.60}{11.98}=2.30
which is interpreted as there is approximately two and one-third standard deviation unit difference between the pretest and posttest means (with the posttest having the larger mean), a very large effect size according to Cohen's subjective standard.

A researcher randomly assigns individuals to two groups, one in which calming instrumental music is played softly and another in which no music is played. The researcher collects time on task, measured in minutes. The research question is: Is there a greater average time on task for individuals who had music as compared to individuals who did not have music? Which one of the following represents how the ALTERNATIVE hypothesis will be written?

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D

A researcher randomly assigns individuals to two groups, one in which calming instrumental music is played softly and another in which no music is played. The researcher collects time on task, measured in minutes. The research question is: Is there a greater average time on task for individuals who had music as compared to individuals who did not have music? Which one of the following represents how the NULL hypothesis will be written?

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A research article reports the following for an independent t test: = .05, t (6) = −4.40, p .005, d = −3.11. Which of the following reflects the interpretation for the hypothesis test?

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Question 5

Interpret the following SPSS output in terms of the extent to which the assumption of normality has been met. Include appropriate evidence (e.g., statistical values from the output). Interpret the following SPSS output in terms of the extent to which the assumption of normality has been met. Include appropriate evidence (e.g., statistical values from the output). Interpret the following SPSS output in terms of the extent to which the assumption of normality has been met. Include appropriate evidence (e.g., statistical values from the output). Interpret the following SPSS output in terms of the extent to which the assumption of normality has been met. Include appropriate evidence (e.g., statistical values from the output). Interpret the following SPSS output in terms of the extent to which the assumption of normality has been met. Include appropriate evidence (e.g., statistical values from the output).

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Question 6

Review the following SPSS output. Interpret the output including identifying the specific statistical procedure that has been used and reporting the extent to which the test is statistically significant. Include appropriate evidence (e.g., values from the output). t-test for Equality of M eans 95\% Confidence Interval of the Difference Sig. Mean Std. Error t (2-tailed) Difference Difference Lower Upper Years to Equal complete variances master's assumed -3.893 18 .001 -2.7 .69362 -4.15725 -1.24275

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