A poll of 1,200 voters asked what the most significant issue was in the upcoming election. Sixty-five percent answered the economy. We are interested in the population proportion of voters who feel the economy is the most important. A. What is the mean of the distribution? B. What is the standard deviation of the distribution? C. What is the error bound of a 90% confidence interval for the distribution? D. Construct a 90% confidence interval for the distribution.
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A random sample of 1100 registered voters was questioned about their political views. Of those surveyed, 708 felt that "the economy's state" was the most urgent national concern. Answer the questions below. What is the point estimate of the population proportion of voters who feel the economy's state is the most urgent national concern? What is the standard error of this estimate? Check assumptions for a large sample confidence interval. What would be the margin of error for a 95% confidence interval for the population proportion? Compute a 95% confidence interval for the population proportion of voters who feel the economy's state is the most urgent national concern. Give an interpretation of the confidence interval from (d) in the context of the problem.
Lien L.
a) A county clerk wants to estimate the proportion of voters who will need special election facilities. Suppose a sample of 400 voters was taken. If 150 need special election facilities, what is the upper confidence limit (UCL) for the 90% confidence interval for the population proportion of voters who will need special election facilities. Round your answer to 3 decimal places. b) A hotel chain wants to estimate the mean number of rooms rented daily in a given month. The population of rooms rented daily is assumed to be normally distributed for each month with a standard deviation of 240 rooms. During February, a sample of 25 days has a sample mean of 370 rooms. What is the upper confidence limit (UCL) of the 99% confidence interval for the mean number of rooms rented daily in a given month? Round your answer to the nearest whole number.
Joshua A.
A polling company conducts an annual poll of adults about political opinions. The survey asked a random sample of 2190 adults whether they think things in the country are going in the right direction or in the wrong direction. 43% said that things were going in the wrong direction. Complete parts a and b below. a) Calculate the margin of error for the proportion of all adults who think things are going in the wrong direction for 90% confidence. b) Explain what this margin of error means. Select the correct choice below and fill in the answer box within your choice. A. We are 90% confident that the observed proportion of adults that responded "wrong track" is within __ of the population proportion. B. We are 90% confident that the observed proportion of adults that responded "wrong track" is within __ of the sample proportion. C. The probability that any given adult surveyed from the population will respond "wrong track" is __. D. The probability that any given adult surveyed from the sample responded "wrong track" is __.
Supreeta N.
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