What is the point estimate and 97% confidence interval?

**Genevieve03** · December 7th 2011, 07:20 PM

Hi everyone. This is my first post on here. I have to do several problems similar to this on an upcoming exam and would really appreciate anyone explaining how I solve it. Thank you!

The mean annual earnings of pharmacists in the US are $230,000 and those of pediatricians to be $225,000. Suppose that these results are based on a random sample of 300 pharmacists and 400 pediatricians and that the population standard deviations are $28,000 and $32,000.

A.) What is the point estimate?
B.) Construct a 97% confidence interval for the mean difference between the mean annual earnings of pharmacists and pediatricians.

**pickslides** · December 7th 2011, 07:37 PM

Try $\bar{x}_1-\bar{x}_2\pm Z_{0.97}\times \sqrt{\frac{\sigma_1^2}{n_1}+\frac{\sigma_2^2}{n_2 }}$

**Genevieve03** · December 7th 2011, 08:53 PM

Thanks a lot pickslides. I have a big exam coming up so I really appreciate it!

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