Exam 81: Understanding Descriptive and Inferential Statistics for Psychological Research

In order to determine how much two means must differ for this difference to be considered "real and not due to chance," we must use a procedure known as percent variance.

Often,two correlated measures are related as a result of the influence of a third variable.

Descriptive statistics are helpful in doing all of the following EXCEPT

The range and standard deviation are measures of _______.

For his study,Guy has chosen the most commonly used correlation coefficient,which is the _______.

The college admissions office has determined that the correlation between IQ scores and college grade point average is .50.What percent of the variation in college grades is accounted for by knowing IQ scores?

The Reeds have five children aged 2,6,9,11,and 14.The median age of the Reed children is

A graph of a frequency distribution in which the number of scores falling in each class is represented by points on a line is called a(n) _______.

Which of the following correlation coefficients indicates the strongest relationship?

Regarding statistics,which of the following statements is FALSE?

Measures of central tendency

Correlations allow us to determine causation between two variables.

Regarding correlations,which of the following statements is FALSE?

After administering a unit test to her psychology students,a college professor calculates the mean and range for this test in order to better understand the performance of her students on the material in this unit.This professor is using inferential statistics.

Correlations are important in

Of the 4,000 students at Meridian Community College,300 were surveyed regarding their views on the menu at the college cafeteria.All of the students at Meridian Community College would be the

Kip is sorting scores into four classes of equal size,which she then puts in order.Kip is creating a

Measures of variability provide a single score that describes how scattered or "spread out" a distribution of scores is.

Graphical statistics belong to the category of

In a memory test,the test of statistical significance used showed a probability of .025 that the group mean of the experimental group and the group mean of the control group would differ as much as they do by chance alone.This allows us to