What kind of survey (mail. telephone. interview, web, direct observation] would you recommend that a small laundry and dry cleaning business use for each of the following purposes, and why?
a. To estimate the proportion of customers preferring opening hours at 7 a.m. instead of 8 a.m.
b. To estimate the proportion of customers who have only laundry and no dry cleaning.
c. To estimate the proportion of residents in the same zip code who spend more than $20 a month on dry cleaning.
d. To estimate the proportion of its seven employees who think it is too hot inside the building.
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