A cell phone plan let's you choose how many minutes are included each month. the table shows the plans monthly cost for a given numbers of included minutes x. A) if you don't use any minutes, how much do you spend? B) what do you pay per minute? C) how much will you spend for 250 minutes? minutes included, x(100,200,300,400,500) cost of plan ($),y( 14,20,26,32,38)

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