The following data give the speed (in miles per hour), as measured by radar, of 10 cars traveling on Interstate l-81. 70, 67, 66, 68, 76, 79, 76, 69, 78, 71 Assuming that the speed of all cars...

Extracted text: The following data give the speed (in miles per hour), as measured by radar, of 10 cars traveling on Interstate l-81. 70, 67, 66, 68, 76, 79, 76, 69, 78, 71 Assuming that the speed of all cars traveling on this highway have a normal distribution, construct a 90 % confidence interval for the mean speed of all cars traveling on l-81. Note 1: Your confidence interval should be given in the format of (a, b) where a and b are two numbers. Note 2: Round to the nearest tenth in your answer.