An internet service ran a survey of its users and asked if they preferred a real Christmas tree or a fake

An internet service ran a survey of its users and asked if they preferred a real Christmas tree or a fake one. They received 6431 responses, and 3852 of them preferred a real tree. Given that 3852 is 59.9% of 6431, can we conclude that about 60% of people who observe Christmas prefer a real tree? Why or why not? 2. (4 points) An editorial in a magazine reported that adding a certain detergent to a load of laundry would reduce stains by 150%. What is wrong with this statement? 3. (5 points) A supermarket is considering expanding its services by adding a pharmacy, but prior to doing so it will use a survey to determine the extent to which its customers are interested in such a service. The employees suggested four different survey procedures: (a) Ask customers to voluntarily phone in their preferences; (b) Ask customers to voluntarily mail in their preferences; (c) Survey a selection of people whose names are randomly chosen from a list of all customers; or (d) Survey a selection of people whose names are randomly chosen from the telephone directory. Which survey procedure do you think would be the most appropriate for obtaining a statistically unbiased sample? Please explain your answer. 4. (5 points) The following graph shows the population of Washington D.C., in 2000 and in 2010. What is wrong with this graph?