An experiment was conducted to determine whether providing candy to dining parties resulted in a higher tip percentage. The following data were collected on the tip percentages for two independent samples of dining parties:


Sample 1 (No Candy):
Sample size $\left(n{}_1\right)=40$
Mean tip percentage $\left({\bar{x}}_1\right)=15$
Standard deviation $\left(s_1\right)=4$


Sample 2 (Candy Given):
Sample size $\left(n_2\right)=45$
Mean tip percentage $({\bar{x}}_2=18$
Standard deviation $\left(s_2\right)=5$


Use a $0.05$ significance level to test the claim that giving candy results in greater tips.