A market researcher is interested in knowing the type oftraining that works best

A market researcher is interested in knowing the type oftraining that works best for DVD users. Thirty consumers arerandomly selected from a population of known DVD owners (i.e.users). Ten users are trained by giving them the DVD users manualand allowing them to read it. Another ten users are trained from a30 minute DVD user training video. Another ten users are trainedfrom a self-paced computer tutorial. The users are then timed intheir ability to setup and program the DVD by performing a seriesof operations. Which statistical analysis technique should be used?What is the null hypothesis? Can the market researcher get ananswer? Why or why not?