In a survey of 500 U.S. adults, 45% of them said that lounging at the beach was their “dream vacation.” Assuming this to be a simple random sample of U.S. adults, construct and interpret the 95% and 99% confidence intervals for the proportion of U.S. adults who consider lounging at the beach to be their dream vacation.
Answer to relevant QuestionsFor the following simple random sample of household incomes (thousands of dollars) from a large county, construct and interpret the 90% and 95% confidence intervals for the population mean. The data are also in file XR09087. The activities director of a large university has surveyed a simple random sample of 100 students for the purpose of determining approximately how many students to expect at next month’s awards ceremony to be held in the ...An airline would like to determine, within 3 percentage points and with 95% confidence, the percentage of next month’s customers who judge the courtesy of its employees as being “very good to excellent.” What sample ...An exterminator claims that no more than 10% of the homes he treats have termite problems within 1 year after treatment. In a sample of 100 homes, local officials find that 14 had termites less than 1 year after being ...In making aluminum castings into alternator housings, an average of 3.5 ounces per casting must be trimmed off and recycled as a raw material. A new manufacturing procedure has been proposed to reduce the amount of aluminum ...
Post your question