2.24 Suppose that you were asked to help design a survey of adult city residents in order to estimate the proportion that would support a sales tax increase. The plan is to

use a stratied random sample, and three stratication schemes have been proposed.

Scheme 1: Stratify adult residents into four strata based on the rst letter of their last name (AG, HN, OT, UZ)

Scheme 2: Stratify adult residents into three strata: col- lege students, nonstudents who work full time, nonstudents who do not work full time.

Scheme 3: Stratify adult residents into ve strata by ran- domly assigning residents into one of the ve strata.

Which of the three stratication schemes would be best in this situation? Explain.