A statistician wishes to determine the difference between two population means. A sample of 18 items from Population #1 yields a mean of 205 with a standard deviation of 12. The sample of 15 items from Population #2 yields a mean of 190 with a standard deviation of 10. Assume that the values are normally distributed in each population.     What is the 95% confidence interval for the difference in the means of the two populations? a. 15±8.046 b. 15 ±8.1611 c. 15 ±7.5062 d. 15 ±8.2147

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A statistician wishes to determine the difference between two population means. A sample of 18 items from Population #1 yields a mean of 205 with a standard deviation of 12. The sample of 15 items from Population #2 yields a mean of 190 with a standard deviation of 10. Assume that the values are normally distributed in each population.

 

 

What is the 95% confidence interval for the difference in the means of the two populations?

a. 15±8.046

b. 15 ±8.1611

c. 15 ±7.5062

d. 15 ±8.2147

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