Bookmarks People Window Help My Pitt Home Take Test: Homework 11-218 x ourseweb.

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Bookmarks People Window Help My Pitt Home Take Test: Homework 11-218 x ourseweb.pitt.edu/webapps/assessment/take/launch.jsp?course assessment id139134 1&course; id- 413655 18 Question Completion Status A study was conducted by Lalonde (1986) to look at the effect of worker training on earnings. As part of this study, information on real annual earnings in thousands of dollars for 1978 were examined. Sample data were collected in a survey using random sampling. The following table summarizes earnings (greater than 0) by ethnic group: other, black and Hispanic. The earnings were positively skewed so they were square root transformed so they were approximately normally distributed Mean St. Dev. n Other 4.9606 1.4021 1588 Black 3.7712 1.3848 673 Hispanic 4.3412 1.6483 83 The box plot below shows the distribution of the transformed earnings: 120 100 10 60 40 Other Black Hspanic Suppose the study had only collected data on eamings for others and blacks. Is there enough evidence to conclude that the variances for the square root transformed earnings differs between blacks and Hispanics? Suppose further you wanted to test the following hypotheses: Click Save and Submit to save and submit. Ctick Save All Answers to save all answers. Save All Answers Save and Su 4

Explanation / Answer

confidence interval at

lower bound is (-0.94)

upper bound is (-0.19)

t value is(-3.04)

p value .003

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