A manufacturer of a gas additive claims that it improves gas mileage. A random sample of 30 drivers tests this claim by determining their gas mileage for a full tank of gas that contains the additive (X1) and for a full tank of gas that does not contain the additive (X2). The sample mean difference D-Bar equals 2.12 miles (in favor of the additive) and the estimated standard error equals 1.50 miles. (a) Using t- test the null hypothesis at the .01 level of significance (b) Specify the p-value for this result. _____________

Paper details:Its a group assignment and I want the writer to do the descriptive statistics and hypothesis testing. its in proposal 2 file