Go back to Application 6.1 earlier in this chapter and review the study by Ziefle and Bay (2005).
1. State null and alternative hypotheses for the impact of phone complexity on the time it takes to complete a series of tasks using the phone. Remember, the Siemens phone had been determined to be more complex than the Nokia phone.
2. Now develop null and alternative hypotheses that might make sense to examine the impact of age on the use of cell phones. Remember that the study used two age groups: older (50-65) and younger (20-30). You do not have information about what the researchers found in terms of age but what might you predict they would find?