# Question: A statistician estimates the 90 confidence interval for the mean

A statistician estimates the 90% confidence interval for the mean of a normally distributed population as 172.58 ± 3.74 at the end of a sampling experiment, assuming a known population standard deviation. What is the 95% confidence interval?

**View Solution:**## Answer to relevant Questions

A confidence interval for a population mean is to be estimated. The population standard deviation is guessed to be anywhere from 14 to 24. The half-width B desired could be anywhere from 2 to 7. a. Tabulate the minimum ...1. What is the minimum sample size (of attempts) if the proportion is to be estimated within ± 2% with 95% confidence? What is the associated total cost? 2. What is the minimum sample size if the proportion is to be ...In which direction of will the p-value decrease for the null hypotheses? (a) μ ≥ 10, (b) μ ≤ 10, (c) μ = 10? New software companies that create programs for World Wide Web applications believe that average staff age at these companies is 27. To test this two-tailed hypothesis, a random sample is collected: 41, 18, 25, 36, 26, 35, ...According to a financial planner, individuals should in theory save 7% to 10% of their income over their working life, if they desire a reasonably comfortable retirement. An agency wants to test whether this actually happens ...Post your question