Chapter 2.6, Problem 24SE

What sources of error might you encounter if you want to know (a) about the dating habits of college men, so you go to 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 hew often they attend; (c) how often people eat at McDonald’s, so you stand outside a particular McDonald’s and ask entering customers how often they eat at McDonald’s?