A sample of six clusters is to be taken from a population with clusters and elements. The values of , , and for each cluster in the sample follow. Excel File: data21-15.xls Cluster () 1 35 3,500 3 2 15 965 0 3 12 960 1 4 23 2,070 4 5 20 1,100 3 6 25 1,805 2 Totals 130 10,400 13 a. Develop point estimates of the population mean, total, and proportion. 80 48000 .1 (to 2 decimals) b. Develop an approximate confidence interval for the population mean (to 2 decimals). 64.6277 to 95.3723 c. Develop an approximate confidence interval for the population total (to 2 decimals). to d. Develop an approximate confidence interval for the population proportion (to 4 decimals). .0578 to .1422