PDA

View Full Version : Confidence interval


tereskal
Feb 4, 2009, 07:48 PM
A researcher claims that the average age of people who buy lottery tickets is 70. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 16 at alpha+0.05 is there enough evidence to reject the researcher's claim

galactus
Feb 4, 2009, 08:11 PM
What seems to be your difficulty?

What ages shown below? How can we help if the problem is incomplete? We need the sample mean.