In past years, approximately 20% of all U.S. families purchased potato chips at least once a month. You are interested in determining the fraction of all U.S. families that currently purchase potato chips at least once a month. How many families must you survey if you want to be 99% sure that your estimate of the relevant proportion is accurate within 2%?
Answer to relevant QuestionsContinuing Problem 32, suppose that the officials in this city want to estimate the proportion of taxpayers whose annual real estate tax payments exceed $2000. a. What sample size is required to generate a 99% confidence ...The widths of 100 elevator rails have been measured. The sample mean and standard deviation of the elevator rails are 2.05 inches and 0.01 inch. a. Find a 95% confidence interval for the average width of an elevator rail. Do ...Find a 95% confidence interval for the proportion of all customers whose order is for more than $100. Then do this separately for each of three times of day. Find a 95% confidence interval for the proportion of all large customers who pay bills of at least $1000 at least 15 days after they are billed. Comfy wonders whether there are differences across pairs of cities that receive the same discount. a. Find a 95% confidence interval for the difference between the mean amount spent in Tucson and the similar mean in San ...
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