Flashcards in Chapter 5 Glossary Deck (70)
What is an abscissa?
The x axis on a graph.
What is the alpha level?
Type 1 error level (probability of incorrectly rejecting the null hypothesis).
What is the analysis of variance?
Statistical procedure that analyses mean differences between two or more groups by comparing between-groups and within-group variance.
What is average deviation?
The average distance from the mean.
What is beta?
The probability of making a type two error.
What is bimodal?
A distribution of scores that has two modes.
What is central tendency?
Average or typical score in a distribution.
What is a coefficient alpha?
An index of internal consistency reliability.
What is continuous variable?
Variable that can theoretically take on an infinite number of values.
What is a correlation coefficient?
Index of the degree of linear relationship between variables.
What is correlation?
Degree of linear relationship between two or more variables.
What is covary?
When the values of two or more measures change together.
What is cross-tabulation?
Procedure that illustrates the relationship between two or more nominal variables. A cross tabulation table shows the frequency of participants who show each particular combination of characteristics.
What is a degree of freedom?
A statistical concept in which one degree of freedom is lost each time that a population parameter is estimated.
What are descriptive statistics?
Statistics that summarise and/or describe a sample of scores.
What are effect size?
Index of the size of the difference between groups, expressed in standard deviation units.
What are frequencies?
The number of objects or participants that fall into a specified category.
What is frequency distribution?
Organisational device used to simplify large data sets.
What is a frequency polygon?
Graph that illustrates a frequency distribution by placing a dot above each possible score at a height that indicates the score's frequency and then connect the dots.
What are graphs?
A means of presenting data visually.
What are grouped frequency distribution?
Lists the frequency of scores in equal-size intervals.
What is a histogram?
A bar graph in which the frequency of scores is represented by the height of the bar.
What are individual differences?
Natural difference among people.
What are inferiental statistics?
Statistical procedures that allow us to decide whether the sample data suggest that population difference exist.
What is linear relationship?
Relationship between the variables that, when plotted in a standard coordinate system, cluster around a straight line.
What is a mean?
Arithmetic average of scores that should be computed only for score data.
What are measures of central tendency?
Descriptive statistics that indicate the typical score.
What is median?
Middle score in a distribution.
What is mode?
Most frequent score in a distribution.