What sources of error might you encounter if you want to know (a) about the dating habits of college men, so you go10 a dorm meeting and ask students how many dates they have had in the last year; (b) how often people attend religious services, so you stand outside a particular Church on Sunday and ask entering individuals how often they attend; (c) how often people eat at McDonald’s. so you stand outside a particular McDonald’ s and ask entering customers bow often they eat at McDonald’s
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