Introduction to Statistics Practice Quiz

In a correlational study,

2 variables are measured and there is only 1 group of participants.

Which of the following is done last in the order of operations?

Addition

A discrete variable must be measured on a nominal or an ordinal scale.

False

An experimental research study typically involves measuring two scores for each individual in one group of participants.

False

For the following scores, ∑(X + 1) ² = 81. Scores: 1, 3, 0, 1

False

To compute ∑X², you first add the scores, then square the total.

False

Using the average score to describe a sample is an example of inferential statistics.

False

For statistical purposes, it usually is not important to differentiate between which two scales of measurement?

Interval and ratio

What is the final step to be performed when computing ∑(X - 2)² ?

Sum the squared values

What additional information is obtained by measuring two individuals on an ordinal scale compared to a nominal scale?

The direction of the difference

Which of the following is an example of a discrete variable? a. The amount of weight gained for each freshman at a local college b. The amount of time to solve a problem c. The age of each student in a psychology class d. The gender of each student in a psychology class

The gender of each student in a psychology class

A correlational study is used to examine the relationship between variables but cannot determine whether it is a cause-and-effect relationship.

True

A high school gym teacher records how much time each student requires to complete a one-mile run. This is an example of measuring a continuous variable.

True

A researcher is interested in the average income for registered voters in the United States. The entire group of registered voters is an example of a population.

True

For the following scores, ∑X² = 35. Scores: 1, 3, 5

True

Recording the number of text messages you receive each day would be an example of measuring a discrete variable.

True

If it is impossible to divide the existing categories of a variable, then it is an example of a _______ variable.

discrete

A researcher uses an anonymous survey to investigate the television-viewing habits of American adolescents. The entire group of American adolescents is an example of a _________.

population

For an experiment comparing two methods of teaching social skills training to autistic children, the independent variable is _______ and the dependent variable is _______.

teaching methods; the social skills that are learned

You are instructed to subtract 4 points from each score, square the resulting value, and find the sum of the squared numbers. How would this set of instructions be expressed in summation notation?

∑(X - 4)²