Arandom sample means that: (a)every person has an equal chance of being selected (b) there is no pre-planning in the selection process (c) every person who is encountered is selected (d) researchers decide how many people of certain types they need in a survey

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 99% confidence interval estimate of μ, the mean duration of game play. 4028 4316 4816 4650 4036 5010 4833 4331 4307