6) A sample of 10 items has a mean 20 and a standard deviation 0.5. A second sample of 15 items has a mean 19.5 and standard deviation 0.4. Assuming that the population variances are equal,, estimate 99% confidence interval for the difference between the two population means.
7) As an aid in the establishment of personnel requirements, the director of MMC wishes to estimate the mean number of people who are admitted to emergency room during a 24-hour period. The director randomly selects 64 different 24-hour periods and determines the number of admissions for each. For this sample a x̄ = 19.8 and s =25. Estimate the number of admissions per 24-hour period with 95% confidence interval at MMC.
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