Parent opinion, part 2 Let’s revisit the school systemdescribed in Exercise 17. Four new sampling strategieshave been proposed to help the PTA determine whetherparents favor requiring elementary students to pass a test in order to be promoted to the next grade. For each, indi-cate what kind of sampling strategy is involved and what (if any) biases might result.a) Run a poll on the local TV news, asking people to dialone of two phone numbers to indicate whether theyfavor or oppose the plan.b) Hold a PTA meeting at each of the 20 elementaryschools, and tally the opinions expressed by those whoattend the meetings. c) Randomly select one class at each elementary schooland contact each of those parents. d) Go through the district’s enrollment records, select-ing every 40th parent. PTA volunteers will go to those homes to interview the people chosen.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.