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 95% confidence interval between the difference in rates between the two departments (round off to four decimal places) is: A. [2.9782; 6.4218] B. [1.5083; 7.8917] C. [2.9782; 7.8917]

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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 95% confidence interval between the difference in rates between the two departments (round off to four decimal places) is:

 

A. [2.9782; 6.4218]

B. [1.5083; 7.8917]

C. [2.9782; 7.8917]

D. [1.5083; 6.4218]

E. None of the preceding

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