A reporter for a local television station visits the city's new upscale shopping mall the day before Christmas to interview shoppers. He questions the first 25 shoppers he meets outside one of department stores at the mall. He asks them whether their overall feelings about Christmas shopping are positive, neutral, or negative. Select the reason(s) why it may be risky to act as if the first 25 shoppers at this particular location are an SRS of all shoppers in the city. a. Shoppers at the mall the day before Christmas does not guarantee every shopper in the population has an equal chance to be in the sample.
b. Surveying shoppers the day before Christmas is a convenience sample, so it is a simple random sample
c. Surveying shoppers at the mall the day after Christmas may not be a good represenation of all shoppers in the city.
d. Having the reporter ask questions is not a double-blind study.