The librarian at a public library wants to determine what proportion of the library users are children. Identify the sampling method used in each example below.
1) Simple random sampling 2) cluster sampling 3) convenience sampling 4) stratified sampling 5) systematic sampling
-As long as there isn't a line of people waiting to check out, each
time a patron checks out a book, the librarian records whether the patron is an adult or a
child.
-Each day this week, the librarian randomly selects 15 patrons
that check out a book that day and records whether the patron is an adult or a child.
-For each seventh patron that checks out a book, the librarian
records whether the patron is an adult or a child.
-The librarian randomly selects two days this week. On those
days, each time a patron checks out a book, the librarian records whether the patron is
an adult or a child.
-Each time a patron checks out a book, the librarian rolls a six-
sided die. If the die lands on six, then the librarian records whether the patron is an adult
or a child.