Determine the type of sampling (random, stratified, systematic,
cluster, convenience) being conducted in the following situations.
a. On election day, a pollster for XYZ News positions herself outside a polling place near her office. She then asks the first 50 voters leaving the polling place to complete a survey.
b. An internet service provider randomly selects 15 residential blocks from a large city. It then surveys every household in these 15 blocks to determine the number that would upgrade to higher speed service, if it were available.
c. At a high school there are 574 sophomores, 562 juniors, and 532 seniors. The principal randomly selects 30 students from each group (sophomores, juniors, and seniors) to take a survey on the cafeteria’s food.
d. Officials for the PA Turnpike Commission offer a survey to every 50th vehicle passing through a toll facility.

a. Convenience

b. Random

c. Stratified

d. Systematic

Explanation:

Types of sampling:

The selection of sample is arbitrary and each member has an equal chance of selection.

This selection does not take probability of selection into account rather focuses on the convenience and proximity of the member for selection.

An ordered system is decided to choose the members for this sample.

This sampling plan divided the population into groups, called clusters. A cluster is then randomly selected from the selected population.

The members of the population are divided into groups, called strata. A random sample is drawn from each strata.

your answer is confidentiality

do not use any of these common illegal characters/symbols:

# pound

% percent

& ampersand

{ left curly bracket

} right curly bracket

\ back slash

< left angle bracket

> right angle bracket

* asterisk

? question mark

/ forward slash

  blank spaces

$ dollar sign

! exclamation point

' single quotes

" double quotes

: colon

@ at sign