A sample of six clusters is to be taken from a population with N = 30 clusters and M = 600 elements. The following table shows values of Mi, xi, and ai for each cluster in the sample.

a. Develop point estimates of the population mean, total, and proportion.
b. Develop an approximate 95% confidence interval for the population mean.
c. Develop an approximate 95% confidence interval for the population total.
d. Develop an approximate 95% confidence interval for the population proportion.

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