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. In order to test whether the proportion of plants with more than 10 worker-hours lost was higher in plants with no changes than in the ones with the new equipment installed, you need to perform: O A z-test for population proportion O An F-test for difference in variances A chi-squared test for variande O A t-test for the mean A paired sample t-test for difference in means An F-test for difference in means 0 A z-test for the mean O An independent samples t-test for difference in means (equal variances) 0 A z-test for difference in proportions A z-test for the difference in means An independent samples t-test for difference in means (unequal variances)

Explanation / Answer

as here we need to find out if there is differnece in proportion exist if equipment is installed

therefore last option:

we need to conduct: A z test for difference in proportions

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