Consider a frame consisting of 500 households in a middle-class neighborhood that was the recent focus of an economic development study conducted by the local government. The data are in the file P2_6.XLS. 

a. Compute the mean, median, and standard deviation of the monthly home mortgage or rent payments of all households in the given frame. 

b. Use Excel to choose a systematic sample of size 25 from this frame. 

c. Compute the mean, median, and standard deviation of the monthly home mortgage or rent payments for the 25 households included in your systematic sample. Compare these statistics with your computed descriptive measures for the frame obtained in part a.