Compute the test statistic used to test the null hypothesis The National Transportation Association reports that more accidents are caused by cell phones than by drunken drivers The cell phone industry their own study to refute the claim They obtained 10 000 auto acciden reports and found that 15 were caused by drivers using cell phones If the actual rate for drunken driver accidents is 13 were the cell phone makers happy with the results H p 13 Use a 95 confidence level O 5 947 O 11 894