# Question

An analyst from an energy research institute in California wishes to precisely estimate the 99% confidence interval for the average price of unleaded gasoline in the state. In particular, she does not want the sample mean to deviate from the population mean by more than $0.06. What is the minimum number of gas stations that she should include in her sample if she uses the standard deviation estimate of $0.32, as reported in the popular press?

## Answer to relevant Questions

The manager of a pizza chain in Albuquerque, New Mexico, wants to determine the average size of their advertised 16-inch pizzas. She takes a random sample of 25 pizzas and records their mean and standard deviation as 16.10 ...Linda Barnes has learned from prior studies that one out of five applicants gets admitted to top MBA programs in the country. She wishes to construct her own 90% confidence interval for the acceptance rate in top MBA ...The information gathered from opinion polls and political surveys is becoming so increasingly important for candidates on the campaign trail that it is hard to imagine an election that lacks extensive polling. An NBC News/ ...The screening process for detecting a rare disease is not perfect. Researchers have developed a blood test that is considered fairly reliable. It gives a positive reaction in 98% of the people who have that disease. However, ...Consider the following hypothesis test:H0: µ = -100HA: µ ≠ -100A random sample of 36 observations yields a sample mean of -125. The population standard deviation is 42. If α = 0.01, find the critical value(s). What is ...Post your question

0