A stratified simple random sample was taken with the following results. Excel File: data21-07.xls Stratum (h) Ph N 1 138 30 0.50 200 20 103 25 0.78 250 30 210 50 0.21 100 25 a. Develop an estimate of the population mean for each stratum. Stratum 1 138 Stratum 2 103 Stratum 3 210 b. Develop an approximate 95% confidence interval for the population mean in each stratum (to 4 decimals). Stratum 1 124.6801 to 151.3199 Stratum 2 94.2429 to 111.7572 Stratum 3 192.1261 to 227.8739 c. Develop an approximate 95% confidence interval for the overall population mean (to 4 decimals). 132.0445 to 138.3191

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