1. Population, Selection, Assignment
Directions: For each of the following examples, use
An Expo marker to write your answer on the white board. After I read the statement
your group will display the answers by holding up the
White board.
WHITE BOARD CHOICES
1. Population
2. Selection (Random or Non-Random) Note: Random
selection is the method used to obtain a random sample
3. Assignment (Random or Non-Random)

2. Population, Selection or Assignment?
Jonathan is trying to determine how completing
daily crossword puzzles impacts cognitive
decline in Americans over the age of 80.
All Americans who are over the age of 80. _______________
ANSWER: POPULATION
The 20 individuals chosen by chance over the age of 80 in his hometown who he actually studies .___________________
ANSWER: RANDOM SELECTION (of a
random sample)
Population
Selection

3. Population, Selection or Assignment?
A researcher wants to determine if his new Internet study guide will improve test scores in his college classes. He gives all the students in his college classes a number and then by chance chooses 50 numbers to determine who will participate in the study.
All the students in the professor’s classes: __________
ANSWER: POPULATION
The 50 picked to be in the study: ________________
ANSWER: RANDOM SELECTION (of a
random sample)
Random Selection (within this specific class)

4. Population, Selection or Assignment?
A researcher recruits 100 participants for an experiment on memory. He places their names in an alphabetical list. Those who have last names that begin with A-L are placed into the group that receive memory training. Those whose last names begin with M-Z are placed in the group which does not receive any memory training.
This is an example of __________________.
ANSWER: NON-RANDOM ASSIGNMENT
Non-random assignment

5. Population, Selection or Assignment?
The names in the hat represent all people who can potentially be in the study or the ___________.
ANSWER: POPULATION
The 50 names pulled by chance from the hat who will actually take part in the study are______________.
ANSWER: RANDOM SELECTION
(of a random sample)
Random Selection

6. Population, Selection or Assignment?
Stacey wants to study the impact of interference on learning when an individual attempts to learn two languages at the same time. She will test adult American learners. She asks all of her colleagues in the Human Relations department to be in her study.
This is ________________.
ANSWER: NON-RANDOM SELECTION (of a
non-random sample)
Non-random selection

7. Population, Selection or Assignment?
Professor Huntington places the names of her participants for an experiment into a computer. The computer arbitrarily picks names which she then places them into either the control or experimental group.
This is ______________________.
ANSWER: RANDOM ASSIGNMENT
Random assignment

8. Population, Selection or Assignment?
Which process is involved when determining who will be in the experimental condition and who will be in the control condition when it is determined purely by chance? ____________
ANSWER:
RANDOM ASSIGNMENT
Random assignment

9. Population, Selection or Assignment?
Calvin would like to study the impact of exercise on GPA at Stevenson High School. He defines those who can be in his study as all the students at SHS. This is _________.
ANSWER: The POPULATION
If all students at SHS have an equal opportunity of being chosen for the study it is ________________.
ANSWER: RANDOM SELECTION (of a random
sample)
Population

10. Population, Selection or Assignment?
Nathan wants to determine if getting an extra hour of sleep improves academic performance for students on his campus. He decides all students on campus are potential candidates for his study.
This is _________________
ANSWER: The POPULATION
Population

11. Population, Selection or Assignment?
Random Assignment
What procedure is being depicted in this picture? _______________
ANSWER: RANDOM ASSIGNMENT

12. Population, Selection or Assignment?
For a group of individuals hospitalized with schizophrenia at four local hospitals, a researcher identifies each individual with a code. He then has a computer indiscriminately choose which individuals will be in the picked for the study.
This is_________________.
ANSWER: RANDOM SELECTION (of a
random sample)
Random Selection