Need confidence interval

An experiment was conducted to determine whether n X S giving candy to dining parties resulted in greater tips. The No candy 34 19.03 1.41 mean tip percentages and standard deviations are given in the accompanying table along with the sample sizes. Two candies H2 34 21.27 2.55 Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b ) result in greater tips. D. Reject the null hypothesis. There is sufficient evidence to support the claim that giving candy does result in greater tips. b. Construct the confidence interval suitable for testing the claim in part (a).