1.A sample of 25 bottles is taken from the production line at a local bottling plant. Assume that the fill amounts follow a normal distribution.
The probability is 90% that the sample variance is less than what percent of the population variance?
2. The amount of money spent by tourists when visiting Disneyland is normally distributed with a standard deviation of $43. How large of a sample must you take in order to ensure that the probability is 0.90 of getting a sample mean within $10 of the population mean?