A store manager wants to know the percentage of shoppers who use coupons. He surveys everyone who enters the meat aisle. He finds that 60 percent of shoppers use coupons. Does the sampling method the store manager used support a valid inference?(1 point)
Responses
No, because not all people who enter the meat aisle use coupons.
Yes, because the sample contains coupon users and non-users.
Yes, because the sample contains coupon users and non-users.
No, because the sample is not chosen randomly.
No, because the sample is not chosen randomly.
Yes, because the manager asked everyone who entered the meat aisle.
No, because the sample is not chosen randomly.
A quality control manager wants to determine the percentage of defective light bulbs in the production line. Which of the following sampling methods would most likely lead to a valid inference?(1 point)
Responses
testing the last 4,000 bulbs in the production line
testing the last 4,000 bulbs in the production line
retesting 100 light bulbs that have already been tested
retesting 100 light bulbs that have already been tested
testing the first 2,000 light bulbs in the production line
testing the first 2,000 light bulbs in the production line
testing every fiftieth light bulb in the production line