A 30 month study is conducted to determine the difference in rates of accidents per month between two departments in an assembly plant. If a sample of 12 from the first department averaged 12.3 accidents per month with a standard deviation of 3.5, and a sample of 9 from the second department averaged 7.6 accidents per month with standard deviation of 3.4, find: The t-value for a 95% confidence interval is:

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Q: 30 month study is conducted to determine the difference in rates of accidents per month between two…

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Q: What value of z should be used to calculate a confidence interval with a 95% confidence level?

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