Indicate whether each statement below is true or false. If false, explain why. a) Asking viewers to call into an 800 number is a good way to obtain a representative sample. b) When writing a survey, it's a good idea to include as many questions as possible to ensure efficiency and to lower costs. c) A recent poll on a website was valid because the sample size was over 1,000,000 respondents. d) Malls are not necessarily good places to conduct surveys because people who frequent malls may not be representative of the population at large. O C. False; making a survey too long makes it a convenience sample for the researchers but also makes the survey biased. O D. False; making a survey too long may reduce the response rate and introduce nonresponse bias. c) Choose the correct answer below. O A. False; the poll would need to be on one more website and have an equal sample size. O B. False; even a large biased survey is still biased. O C. True O D. False; the sample would need to be about twice as large. d) Choose the correct answer below. O A. False; the people at any mall are a simple random sample of the population, because everyone eventually goes to a mall. O B. True O C. False; the people at any mall are representative of the community at large, because everyone eventually goes to a mall. O D. False; malls produce a systematic sampling of the population, because everyone eventually goes to a mall. NextAn internet sale site randomly sent customers to one of three versions of its welcome page. It recorded how long each visitor stayed in the site. A diagram of that experiment is shown to the right. Fill in the parts of the experiment. Choose the correct answer below. Site 1 -> Group 1 O A. Random allocation of sites Site 2 -> Group 2 Compare sales Site 3 -> Group 3 Group 1 - Sale 1 Random allocation O B. of sales > Group 2 - Sale 2 Compare customer feedback Group 3 - Sale 3 Group 1 Site 1 Compare time O C. Random allocation of customers > Group 2 - Site 2 on site Group 3 -> Site 3 Next