Posted by melba on Saturday, June 9, 2012 at 5:06pm.
It would help if you proofread your questions before you posted them.
Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score. Multiply by 47.
Is this your "table 3 in appendix b"?
Twelve different video games showing substance use were observed and the duration times of game play ( in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. use the data to construct a 95% confidence interval estimate of mean duration of game play.
4061,3886,3865,4023,4309,4821,4645,4021,5024,4812,4331,4325