From the four sampling techniques named in class (Random, Stratified, Systematic, Cluster), determine the technique used to choose each of the following samples of University students.

a. Roughly 60% of students are female. A sample of 38 students is chosen so 15 are male and 23 are female.

b. 33 students are chosen from a list of all students by randomly starting at the 22nd student and then choosing every 19th student.

c. A sample is chosen by randomly selecting one of the following collections of students based on the general vicinity of where they live: 1) North of Kapaa, 2) Kapaa/Wailua, 3)Lihue, 4)Koloa to Kalaheo, 5)West of Kalaheo

d. Google churns out numbers between 10-99 at random, and students whose last two digits of their social security numbers match are selected.