A recent study focused on the amount of money single men and women save monthly. The information is summarized next. Assume that the population standard deviations are equal. Sample Size Sample Mean Sample Standard Deviation Men 230 5 Women 280 10 At the .01 significance level, do women save more money than men? What is the test statistic used for this hypothesis? a. tstatistic b. zstatistic C. p-statistic d. dfstatistic