Stuck on this one question from the packet, Can I get an explanation so I can use it as notes/review for a test tomorrow?

Chapter 18 CW #2 - Paired T-test/T-interval After seeing countless commercials claiming one can get cheaper car insurance from an online company, a local insurance agent was concerned that he might lose some customers. To investigate, he randomly selected profiles ( car type, coverage, driving record, etc.) for 10 of his clients and checked online price quotes for their policies. The comparisons are shown in the table. Local Online Price a) Is there evidence that drivers might save money by switching to the online Price Price Diff company? (This is d = local - online; we want to save with online, think about 568 391 177 this for H.) 372 502 270 451 488 -37 1229 903 326 b) How much of a difference would this be? 605 677 -72 1021 1270 -249 783 703 80 844 789 55 307 100 -101 712 702 10 Mean 799.2 753.3 45.9 Std. Dev. 229.3 256.3 175.7