The disk file cancer contains values for breast cancer mortality from 1950 to 1960 (y) and the adult white female population in 1960 () for 301 counties in North Carolina, South Carolina, and Georgia.

a. Make a histogram of the population values for cancer mortality.

b. What are the population mean and total cancer mortality? What are the population variance and standard deviation?

c. Simulate the sampling distribution of the mean of a sample of 25 observations of cancer mortality.

d. Draw a simple random sample of size 25 and use it to estimate the mean and total cancer mortality. e. Estimate the population variance and standard deviation from the sample of part (d).

f. Form 95% confidence intervals for the population mean and total from the sample of part (d). Do the intervals cover the population values?

g. Repeat parts (d) through (f) for a sample of size 100.

h. Suppose that the size of the total population of each county is known and that this information is used to improve the cancer mortality estimates by forming a ratio estimator. Do you think this will be effective? Why or why not?

i. Simulate the sampling distribution of ratio estimators of mean cancer mortality based on a simple random sample of size 25. Compare this result to that of part (c).

j. Draw a simple random sample of size 25 and estimate the population mean and total cancer mortality by calculating ratio estimates. How do these estimates compare to those formed in the usual way in part (d) from the same data?

k. Form confidence intervals about the estimates obtained in part ( j).

l. Stratify the counties into four strata by population size. Randomly sample six observations from each stratum and form estimates of the population mean and total mortality.

m. Stratify the counties into four strata by population size. What are the sampling fractions for proportional allocation and optimal allocation? Compare the variances of the estimates of the population mean obtained using simple random sampling, proportional allocation, and optimal allocation.

n. How much better than those in part (m) will the estimates of the population mean be if 8, 16, 32, or 64 strata are used instead?

 

 

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