Beginning in the second half of 2011, there were widespread protests in many American cities that were primarily against Wall Street corruption and the gap between the rich and the poor in America. According to a Time Magazine/ABT SRBI poll conducted by telephone during October 9–10, 2011, 86% of adults who were familiar with those protests agreed that Wall Street and lobbyists have too much influence in Washington (The New York Times, October 22, 2011). Assume that this percentage is true for the current population of American adults. Let be the proportion in a random sample of 400 American adults who hold the opinion that Wall Street and lobbyists have too much influence in Washington. Find the mean and standard deviation of the sampling distribution of pˆ and describe its shape.
Answer to relevant QuestionsThe following data give the years of teaching experience for all five faculty members of a department at a university. a. Let x denote the years of teaching experience for a faculty member of this department. Write the ...If all possible samples of the same (large) size are selected from a population, what percentage of all sample proportions will be within 3.0 standard deviations (σp̂) of the population proportion? Dartmouth Distribution Warehouse makes deliveries of a large number of products to its customers. It is known that 85% of all the orders it receives from its customers are delivered on time. Let p̂ be the proportion of ...A machine at Keats Corporation fills 64-ounce detergent jugs. The probability distribution of the amount of detergent in these jugs is normal with a mean of 64 ounces and a standard deviation of .4 ounce. The quality control ...In a Time Magazine/Aspen Ideas Festival poll conducted by Penn Schoen Berland during June 1–8, 2011, Americans age 18 years and older were asked, “Overall, do you think the past decade has been one of progress or decline ...
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