Reconsider the sample results in exercise 7.

a. Develop an approximate 95% confidence interval for the proportion in each stratum.
b. Develop a point estimate of the population proportion for the 550 elements in the population.
c. Estimate the standard error of the population proportion.
d. Develop an approximate 95% confidence interval for the population proportion.

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Stratum (h) 138 103 210 30 25 50 Ph .50 78 21 Nh 200 250 100 20 30 25