Question

section 1 - 3
for exercises 39 - 44, classify each sample as random, systematic, stratified, cluster, or other.

1. in a large school district, all teachers from two buildings are interviewed to determine whether they believe the students have less homework to do now than in previous years.
2. all fast - food workers at a randomly selected fast - food restaurant are selected and asked how many hours per week they work.
3. a group of unmarried men are selected using random numbers and asked how long it has been since their last date.
4. every 100th hamburger manufactured is checked to determine its fat content.
5. mail carriers of a large city are divided into four groups according to gender (male or female) and according to whether they walk or ride on their routes. then 10 are selected from each group and interviewed to determine whether they have been bitten by a dog in the last year.
6. people are asked to phone in their response to a survey question.

Explanation:

1. Selecting all teachers from two buildings is cluster sampling as the buildings are clusters within the school - district population.
2. Selecting all workers at a randomly - selected fast - food restaurant is cluster sampling since the restaurant is a cluster.
3. Using random numbers to select a group of unmarried men is random sampling.
4. Checking every 100th hamburger is systematic sampling as there is a fixed sampling interval.
5. Dividing mail carriers into groups based on gender and mode of transportation and then selecting from each group is stratified sampling.
6. People phoning in their responses is a form of convenience sampling (other), as it depends on who chooses to respond.

Answer:

1. Cluster
2. Cluster
3. Random
4. Systematic
5. Stratified
6. Other