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2. A sociologist plans to conduct a survey to estimate the percentage of adults who believe in astrology. How many people must be surveyed if we want a confidence level of 99% and a margin of error of four percentage points? a) Assume that nothing is known about the percentage to be estimated. b) Use the information from a previous Harris survey in which 26% of respondents said that they believed in astrology. c) Does the added knowledge in part (b) have much of an effect on the sample size