6. An industrial statistician wanted to determine if efforts to promote safety have been successful. By checking the records of 250 employees, he found that 30 of them suffered either minor or major injuries that year. A random sample of 400 employees last year revealed that 80 suffered some form of injury. (a). Can the statistician infer at the 5% significance level that efforts to promote safety have been successful? (b). Estimate with 95% confidence the difference in population proportions. 7. A partial ANOVA table in a randomized block design is shown below, where the treatments refer to different high blood pressure drugs, and the blocks refer to different groups of men with high blood pressure Source of Variation SS df MS F Treatments * 4 * * Blocks 3,120 6 * * Error * * 115 Total 12,600 34 Fill in the missing values (identified by asterisks) in the above ANOVA Table. --

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