Two variables X and Y are collected from a random sample of 50 males and a random sample of 50 females, shown in the following scatter plot. group Female Male (a) We know that the overall mean of the combined X values of males and females is 2. Which one of the following numbers is closest to the mean of the X values of females only? 1 (b) We know that the overall standard deviation (SD) of the combined X values of males and females is 1.7. Which one of the following numbers is closest to the SD of the X values of females only? 1 (c) We know that the correlation between the X and Y variables for females only is 0.5. Which one of the following numbers is closet to the correlation between X and Y for the combined data of males and females? -0.5