Independent studies show that the everage salary of 38 r/s woman with a PhD degree is 90.2 K$ with standart deviation 10.8 K, while the average and the standart deviation of 33 r/s men with a PhD degree are 92.6 K$ and 8.37 K$. Construct a 90% confidence interval for the difference between the overall average sallaries of women and men, respectively, with a PhD degree.

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