A clothing store owner wants to know the proportion of customers who used coupons within the last year. He selects in a random order all 2,000 receipts from a database of all purchases within the last year and finds that 340 of them are discounted by coupons. Can the store owner use this sample to estimate the population proportion of customers who used coupons within the last year?
1) Yes.
2) No, because it wasn't a random sample.
3) No, because n(p-hat) < 10 or n(q-hat) < 10.
4) No, because the sample size wasn't at least 30 and the population wasn't normally distributed.
5) No, because we already know the population proportion.