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What stratification variable(s) would you use for each of the following situations:

a An e-mail survey of students at your university to estimate the total
amount of money student spend on textbooks in a term

b A sample of high schools in New York City to estimate what percentage
of high schools offer one or more classes in computer programming

c A sample of public libraries in Washington DC to study the availability
of computer resources, and the per capita expenditure

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