1. Suppose in a city block, there are 200 households (HHs) of which 130 are Omani (O) and 70 expatriate (E). A random sample of 15 households was selected to estimate the medical expenses (in RO) per household per year. The following table provides the sample information. Household (HH) Nationality Medical expenses (RO) 1 200 2 E 350 3 250 4 150 E 250 6. 200 7 E 500 8. 300 9. 450 10 E 400 11 E 100 12 80 13 350 14 E 450 15 120 O= Omani, E=Expatriate a) Estimate the overall average medical expenses per household and obtain a 95% confidence interval for the estimate. Interpret the results.