Slightly-Used Price ($)New Price ($)57,66146,12249,24949,51153,53153,26048,90049,72451,58857,19549,62848,89157,01858,50551,12452,01254,17161,11450,06249,52452,71858,09750,25348,14653,00951,42047,82750,28851,22353,40649,25447,14852,23054,41349,38449,23856,13353,90948,56049,78351,98360,09250,91948,61656,26651,31253,49358,51949,05054,71453,37149,56049,97252,32949,70255,73754,78049,40650,17055,78650,71853,97457,30347,65452,84454,96048,47954,75852,66950,56252,57755,10649,18851,68852,37249,54258,11956,26550,262
(a)
Provide and interpret a point estimate of the difference between the population mean sale price between a slightly-used car and a new car of this make and model. (Enter your answer as a positive amount in dollars. Round your answer to the nearest integer.)
On average, a ---Select--- slightly-used new car costs $ more than a ---Select--- slightly-used new car of this make and model.
(b)
Develop a 99% confidence interval estimate of the difference (in dollars) between the mean sale price between a slightly-used car and a new car of this make and model. (Use Slightly-Used − New. Round your answers to the nearest integer.)
$ to $
Would you feel justified in concluding that the mean sale price of a slightly-used car is higher than a new car of this make and model? Why or why not?
---Select--- Yes No , because ---Select--- both the lower and upper limits are positive the lower limit and upper limit have different signs both the lower and upper limits are negative .