random sample of 10 toothbrushes from Oral # and 15 from Pislips. Each was charged overnight and the students recorded the number of hour of use before needing to be recharged Oral B mothbrushes operated for an average of 129.7 hours with a standard deviation of 1.74 hours Philip's toothbrushes operated for an average of 130.6 hours with a standard deviation of 1.72 hours. The t-test for the two means is appropriate for this situation because Statement 1: The two companies are independent O Statement 3: Samples were taken by random selection Statements 2 & 3 apply Statements 1 & 3 apply