Question

A simple random sample of 41 cities and counties in the United States was selected and the number of positive COVID-19 cases per 1000 citizen each. The mean number of positive cases for this sample of 41 counties and cities was 261, with a standard deviation of 9.5. Due to a couple of extremely high numbers of cases the distribution is skewed heavily to the right. If appropriate, use this information to calculate and interpretas Interval for the mean number of positive COVID-19 cases per 1000 citizens for all counties and cities in the United States. TTT Ariol 3 (12pt) T.E.E.5.225

Answer 1

Solution: nchi tbar: Sample mean = 261 S=0.5 alpha = oool alpha/2=0.0/= 0.005 df = n-1= 1-1= HO t corto for Mo df and 0.005 level of significance in excel is .. THIN.(0-005, 40) 2701459 997. Confidence interval for the meas number of positive couide care per 1000 Citizens for all countries and cites in the united States xbox-t'xs/sqot (n) & bar + + x3/89xt (n) 261*2.7004959 x 9.5/sgol RM1), 2614 2.704459 x 9.5 phol - Syrt = 261-9. Tox454x9.5/Jan 17261+2.7041459x9.5ball . 252-66 , 269-33 Un - x -