question 11 and 12

A tire company wanted to know if the new type of tires that they developed leads to shorter braking distances for cars. The braking distance of a car is how many feet it takes a car to come to a complete stop from a speed of 60 miles an hour. The data from their tests is below. They took a random sample of 10 cars and tested their braking distance with the old style of tire and the new style of tire. Assume braking distances are normally distributed in the population. Use a tcritical of 2.26. What is your calculated t-statistic for this test? Round to 2 decimal places. You must show hand calculation work for this question to get full credit. Answer based on question 11. I calculated the t statistical value for the test and it had [ Select ] degrees of freedom. There [ Select ] a significant difference between the new and old tires