In order to study the eating habits, you select a random sample of 32 people at a restaurant. The average calories consumed by these people is normally distributed. A 98% confidence interval for the population mean gave a margin of error + 31.6. What would be the population standard deviation?

The time to fly between New York City and Chicago is uniformly distributed with a minimum of 120 minutes and a maximum of 150 minutes. What is the probability that a flight is between 140 and 155 minutes?

It is known that the population variance equals 484. With a 0.95 probability, the sample size that needs to be taken to estimate the population mean if the desired margin of error is 5 or less is

Random samples of size 525 are taken from a process (an infinite population) whose population proportion is 03. The standard deviation of the sample propartions (i.e., the standard error of the proportion) is A certain brand of electric bulbs has an average life of 300 hours with a standard deviation of 25. A random sample of 100 bulbs is tested. What is the probability that the sample mean will be less than 295?