Seene accounting firms give the client an option to pay a fee when the tax retuin is completed that guaranteos tax advices and support from the accountant is the client were audited Alarge accounting fim is trying to determine what fee to charge for next yoar's refuens. In previous years, the aclual mean cost to the frim for atilending a client audit session was 5650. To determine if this cost has changed, the fem randomly samples 32 clent audit fees. The sample mean audit cost was 5690 with a standard deviation of $65. Complete parts a and b below a) Develop a 90% confidence interval estimate for the mean audi cost The 90% confidence interval for the mean audit cost b (5671;,509) (Round to the nearest dollar as needed) b) Based on your confidence interval what do you think of the clain that the mean cost has changed? A. The interval does not contain the historical mean 3650 , which does not suppert the claim that the mean cost has changed 21. The interval does not contain the Nistorical mean 5650 , which supports the claim that the mean cost has changed E. The interval contains the bistorical mean $650, which does not support claim that the mean cost has changed 10. The interval contains the historical mean 56%0, which supports ge claim that the mean cost has changed