6. In a survey of 2096 U.S. adults, 1740 think that football teams of all levels should require players who suffer head injuries to take a set amount of time off from playing to recover. (20 points) (a) Find the point estimate for the population proportion p of U.S. adults who think that players who suffer head injuries to take a set amount of time off from playing to recover. (b) Construct a 95% condence interval for the population proportion. Interpret the results. (c) Does it seem possible that the population proportion could be within 99% of the point estimate? Explain. (d) Find the minimum sample size needed to estimate the population proportion at the 99% confidence level in order to ensure that the estimate is accurate within 3% of the population proportion