Question:

Use this excel file as it has the numbers in it:

https://secure.parsa.com/index.php/s/SqBoWZCLcfdx9ob

Chemical engineers wish to compare the fuel economy obtained by two different formulations of gasoline. They selected pairs of cars of the same make and model and driven under similar circumstances, and compared the fuel economy of the two cars in each pair. These data is stored in gasolinexlsx le. Assume that populations are normally distributed. Using the data construct a point estimate and a 90% confidence interval for the difference in average fuel economy between cars operated on Type 1 gasoline and cars operated on Type 2 gasoline. a) Point estimate (keep four decimals) -'~v b) We are 90% confident that the that mean fuel economy with Type 1 gasoline is between (bigger/smaller)