A market researcher is interested in knowing the type of training that works best for DVD users. Thirty consumers are randomly selected from a population of known DVR owners (i.e., users). The first 10 users are trained by giving them the DVR user's manual and allowing them to read it. Another 10 users are trained from a 30-minute DVR user training video. Another 10 users are trained from a self-paced computer tutorial. The users are then timed in their ability to setup and program the DVR by performing a series of operations. Which statistical analysis technique should be used? What is the null hypothesis? Can the market researcher get an answer? Discuss why or why not?