In the spring of 2017, the Consumer Reports National Research Center conducted a survey of 1,007 aduts to learn about their majer heathcare concoms, The survey resits shomait that 576 of the respondents lack confidence they will be able to afford health insurance in the future. (a) What is the point estimate of the population proportion of adults who lack confidence they will be able to afford health insurance in the future. (Round yeur ersiner to twe decirnal places.) (b) At 90% confidence, what is the margin of error? (c) Develop a 90% confidence interval for the population proportion of adults who fack confidence they will be able to afford hearth insurance in the future. (d) Develop a. 95% confidence interval for this population proportion