Answer All 4 please

I In an effort to reduce health care costs. General Motors sponsored a study to help employees stop smoking. In the study. 439 volunteer subjects were randomly assigned to receive tip to $750 for quitting for a year, while the other 439 volunteer subjects were simply encouraged to use traditional methods to stop smoking. After one year. people who had the nancial incentive were 3 times more likely to have quit smoking. What is the statistical question that the researchers are trying to answer? Identify the population and sample. Is this an observational study or an experiment? Explain your answer. 2 Chris is the president of an environmental club at his school. To advertise, he posts yers around campus that ask, \"Should the school ban the sale ofplastic water bottles on campus? Make your voice heard Wednesdays at lunch in room At the next meeting. he polls those in attendance and nds that 80% of students want to ban the sale of plastic water bottles on campus. What type of sample did Chris obtain? .1 Explain why this sampling method is biased. o Explain how Chris could avoid the bias described in the previous parts to this question 3 A US. senator sends out a poll to people who have "liked" h n on Facebook. ask . "Do you approve or disapprove of the US. Supreme Court decision in Citizens United that let corporations and wealthy individuals spend unlimited amounts on campaigns?" Ninetyenine percent of the responses were \"disapprove." Explain how undercoverage might have lead to bias in this survey. Explain how the wording of the question might affect the results of the survey Suppose the wording ofthe question was changed to \"Do you approve or disapprove of the US. Supreme Court decision in Citizens United that promotes freeaspeech during elections for individuals or corporations?" Would this eliminate the bias described above? Explain your reasoning. 4 I A bank wants to estimate the proportion of its checking account customers who prefer to deposit checks in their account using a smartphone rather than making deposits at the local branch bank. Describe how the bank could select an SRS of 100 account holders. Will the sample result be exactly the same as the true population proportion? Explain. Wl: ch would be more likely to yield a sample result close to the true population proportion: an SRS of 50 account holders or an SRS of 100 account holders? Explain Your