telephone poll of 1,000 adult Americans was reported in an issue of Time Magazine. One of the questions asked was "What is the main problem facing the country?" Twenty percent answered "crime." We are interested in the population proportion of adult mericans who feel that crime is the main problem. OTE: If you are using a Student's t-distribution, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) D Part (a) O Part (b) O Part (c) Construct a 95% confidence interval for the population proportion of adult Americans who feel that crime is the main problem. ) State the confidence interval. (Round your answers to four decimal places.)

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