Businesses such as General Mills, Kellogg's, and Betty Crocker regularly use coupons to build brand allegiance and stimulate sales. Marketers believe that the users of paper coupons are different from the users of e-coupons accessed through the Internet. One survey recorded the age of each person who redeemed a coupon along with the type of coupon (either paper or electronic). The sample of 25 traditional paper-coupon clippers had a mean age of 40.0 with a standard deviation of 3.0. The sample of 35 e-coupon users had a mean age of 34.6 years with a standard deviation of 11.2. Assume the population standard deviations are not the same. Using a significance level of 0.01, test the hypothesis of no difference in the mean ages of the two groups of coupon clients. Hint: For the calculations, assume e-coupon as the first sample.

I am having a hard time with p value on this question, I have gotten a z value of -2.7191 and I came up with a p value of 0.0034 that I multiplied by 2 for the two tail test.

i need step by step direction to understand where I have gone wrong