A marketing research firm estimates the proportion of potential customers preferring a certain brand of lipstick by “randomly” selecting 100 women who come by their booth in a shopping mall. Of the 100 sampled, 65 women stated a preference for brand A. a. How would you estimate the true proportion of women preferring brand A, with a bound on the error of estimation? b. What is the target population in this study? c. Did the marketing research firm select a simple random sample? d. What additional problems do you see with this type of sampling

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