3. Inference review, problem 3 Aa Aa A large multi-plant corporation is concerne

Question

3. Inference review, problem 3 Aa Aa A large multi-plant corporation is concerned about safety at the workplace. The corporation installed new safety equipment and would now like to test how effective these changes have been in reducing hazards. Two random samples of 15 plants are drawn. In the first, no changes took place; the second had the equipment installed. The number of worker-hours lost due to injuries is recorded for each plant. The p-value of the F-test was 0.023. In order to test whether the equipment has proven effective, you need to perform: O A z-test for difference in proportions O An independent samples t-test for difference in means (equal variances) O A z-test for population proportion O An F-test for difference in variances O A chi-squared test for variance O An independent samples t-test for difference in means (unequal variances) A z-test for the difference in means O A z-test for the mean O A t-test for the mean O An F-test for difference in means O A paired sample t-test for difference in means

Explanation / Answer

3) Option-D) An F - test for difference in variances.

13) Option - J) A t-test

14) A Z-test test for difference in means.

  

  

  

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