Exam 1

Whether or not a breakfast was given to the students.

A recent study reports that elementary school students who were given a nutritious breakfast each morning had higher test scores than students who did not receive the breakfast. For this study, what is the independent varible?

True.

A researcher surveys n = 200 college students and asks each person to identify his or her favorite movie from the past year. If the results are presented in a frequency distribution graph, the researcher should use a bar graph.

True.

A sample of n - 6 scores hs EX = 48. This smaple has a mean of M = 8.

False.

If a sample has an een number of scores, at least one individual will have a score exactly equal to the mean.

Y axis/X axis.

In a frequency distribution graph, frequencies are presented on the __________ and the scores (categories) are listed on the _________.

False.

In a relazation training experiment, researchers randomly assign participants to receive either 0, 2, 4, or 8 training sessions and then measure time it takes them to fall asleep. The means there are four independent variable in this experiment.

True.

In a sample of n = 3 scores, two scores are each below the mean by 2 points. The third score must thne be above the mean by 4 points.

Add the scores.

What is the first step to be performed in the following mathematical expression? (EX)^2.

False.

A data set is described as consisting of n = 15 scores. Based on the notation being used, the data set is a population.

Mode.

A researcher measures eye color for a sample of n = 50 people. Which measure of central tendency would be appropriate to summarize the measurements?

Statistic

A researcher records the change inn weight (gain or lost) during the first semester of college for each indicidual in a group of 25 freshmen, and calculates the average change in weight. The average is an example of a __________.

False.

A score within one standard deviation of the mean can be considered an extreme score.

Sample; population

Although a research study is typically conducted with a relatively small group of participants known as a __________, most researchers hope to generalize thier results to a much larger group known as a ___________.

Ordinal.

Determining the class standing (1st, 2nd, and so on) for the graduating seniors at a high school would involve measurement on a(n) ________ scale of measurement.

True.

For a distribution with one or two extreme scores, the median is usually a more representative value than the mean.

30.

For a perfectly symmetrical distribution with u = 30, what is the most probable value for the mode?

True.

For a set of scores measured on an ordinal scale, the median is the preferred measure of central tendency.

False.

For a set of scores separated into "male" and "female" categories, the mean and median are appropriate measures of central tendency.

teaching methods; the social skills that are learned.

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

True.

If a researcher measures two individuals on an ordinal scale, then it is impossible to determine how much difference exists between the two people.

Sampling Error

The average verbal SAT score for the entire class of entering freshmen is 530. However, if you select a sample of 20 freshmen and compute their average verbal SAT score you probably will not get exactly 530. What statistical concept is used to explain the natural difference that exists between a sample mean and the corresponding population mean?

negatively skewed

The students in a psychology class seemed to think that the midterm exam was very easy. If they are correct, what is the most likely shape for the distribution of exam scores.

Only a bar graph.

What frequency distribution graph is appropriate for scores measured on a nominal scale?

The gender of each student in a psychology class.

Which of the following is an example of a discrete variable?

Around 70% of the scores will be located within one standard deviation of the mean.

Which of the following is true for most distributions?

S^2

Which of the following symbols identifies the population standard deviation?