Red Fire Grill would like to estimate the proportion of tips that exceed 18% of its dinner bills. Without any knowledge of the population proportion, determine the sample size needed to construct a 90% interval with a margin of error of no more than 4% to estimate the proportion. Verify your result using PHStat.
Answer to relevant QuestionsSuppose Christiana Hospital would like to estimate the proportion of patients who feel that physicians who care for them always communicated effectively when discussing their medical care. A pilot sample of 40 patients found ...The University of Delaware would like to estimate the proportion of fans who purchase concessions at the first basketball game of the new season. The basketball facility has a capacity of 3,500 people and is routinely sold ...Determine the margin of error for an 80% confidence interval to estimate the population mean with σ = 50 for the following sample sizes: a. n = 30 b. n = 45 c. n = 60 Verizon Wireless would like to estimate the average number of text messages received by American teenagers per month. A random sample of 60 teenaged customers was selected. The sample average was 2,272 messages per month, ...A local church has a congregation composed of 362 members. The church’s administrators would like to find out how the congregation would react if the church moved its 11: 00 a.m. service to 10: 00 a.m. A random sample of ...
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