QUESTION 5 A study was conducted by Lalonde (1986) to look at the effect of work

Question

QUESTION 5 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 5.0 1.4 1588 Black 3.8 1.4 673 Hispanic 4.3 1.6 83

Explanation / Answer

Ans:

Anova table:

As,p-value<0.0001,we reject null hypothesis.

There is suffcient evidence to conclude that atleast one mean differs from the others.

SS df MS F p-value between 690.065 2 345.03 174.17 0 within 4637.56 2341 1.98 total 5327.625 2343

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