6. In 2013, Pew Research reported that in a sample of 2000 Americans, 900 Americans reported that they live with one or more chronic conditions. (a) Let p be the proportion of Americans who live with one or more chronic conditions. Calculate p based on this sample. (b) Calculate the standard error. (c) Is a normal distribution an appropriate model for the distribution of p? Briefly explain. (d) Construct a 95% confidence interval for p based on this sample. (e) Interpret your confidence interval in the context of the study.