Refer to Exercise 8.116. Assume that a preliminary sample has shown that 63% of the adults in this city favor legalized casino gambling. How large should the sample size be so that the 95% confidence interval for the population proportion has a margin of error of .05?
Answer to relevant QuestionsLet µ be the hourly wage (excluding tips) for workers who provide hotel room service in a large city. A random sample of a number (more than 30) of such workers yielded a 95% confidence interval for µ of $8.46 to $9.86 ...A gas station attendant would like to estimate p, the proportion of all households that own more than two vehicles. To obtain an estimate, the attendant decides to ask the next 200 gasoline customers how many vehicles their ...The standard deviation for a population is σ = 14.8. A sample of 25 observations selected from this population gave a mean equal to 143.72. The population is known to have a normal distribution. a. Make a 99% confidence ...Determine the sample size for the estimate of µ for the following. a. E = 2.3, σ = 15.40, confidence level = 99% b. E = 4.1, σ = 23.45, confidence level = 95% c. E = 25.9, σ = 122.25, confidence level = 90% A marketing researcher wants to find a 95% confidence interval for the mean amount that visitors to a theme park spend per person per day. She knows that the standard deviation of the amounts spent per person per day by all ...
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