You are sick and tired of having to get a new cell phone every three years. Your friend claims this is all your problem because cell phones last more than 5 years. You want to test his claim and take a sample of 27 people and find that they have replaced their phones a mean of 4.6 years with a standard deviation of 1.9 years. Test your friend's claim at the .10 level of significance. What do you conclude about the null? What do you conclude about his claim? Would your results change if you used a .05 level of significance?