Using the data for age given in Exercise 3.14,

(a) Plot an equal-width histogram of width 10.

(b) Sketch examples of each of the following sampling techniques: SRSWOR, SRSWR, cluster sampling, and stratified sampling. Use samples of size 5 and the strata “youth,” “middle-aged,” and “senior.”

Exercise 3.14.

Suppose that we need to record three measures in a data cube: min (), a verage(), and median( ). Design an efficient computation and storage method for each measure given that the cube allows data to be deleted incrementally (i.e., in small portions at a time) from the cube.