Meaning of Important Terms in Psychology Part 1 for NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.
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Descriptive statistics: Mathematical tools used to describe and summarize numeric data.
Inferential statistics: Mathematical tools used for decision making, for generalizing from small samples, and for drawing conclusions.
Graphical statics: Techniques for presenting numbers pictorially, often by plotting them on a graph.
Frequency distribution: A table that divides an entire range of scores into a series of classes and then records the number of scores that fall into each class.
Histogram: A graph of a frequency distribution in which the number of scores falling in each class is represented by vertical bars.
Frequency polygon: A graph of a frequency distribution in which the number of scores falling in each class is represented by points on a line.
Central tendency: The tendency for a majority of scores to fall in the midrange of possible values.
Mean: A measure of central tendency calculated by adding a group of scores and then dividing by the total number of scores.
Median: A measure of central tendency found by arranging scores from the highest to the lowest and selecting the score that falls in the middle. That is, half the vales in a group of scores fall above the median and half fall below.
Mode: A measure of central tendency found by identifying the most frequently occurring score in a group of scores.
Variability: The tendency for a group of scores to differ in value. Measures of variability indicate the degree to which a group of scores differ from one another.
Range: The difference between the highest and lowest scores in a group of scores.
Standard deviation: An index of how much a typical score differs from the mean of a group of scores.
Z-score: A number that tells how many standard deviations above or below the mean a score is.
Normal curve: A bell-shaped distribution, with a large number of scores in the middle, tapering to very few extremely high and low scores.
Correlation: The existence of a consistent, systematic relationship between two events, measures, or variables.
Scatter diagram: A graph that plots the intersection of paired measures; that is, the points at which paired X and Y measures cross.
Positive relationship: A mathematical relationship in which increase in one measure are matched by increase in the other (or decreases correspond with decreases) .
Zero correlation: The absence of a (linear) mathematical relationship between two measures.
Negative relationship: A mathematical relationship in which increases in one measure are matched by decreases in the other.
Coefficient of correlation: A statistical index ranging from -1.00 to + 1.00 that indicates the direction and degree of correlation.
Perfect positive relationship: A mathematical relationship in which the correlation between two measures is + 1.00.
Perfect negative relationship: A mathematical relationship in which the correlation between two measures is -1.00.
Percent of variance: A portion of the total amount of variation in a group of scores.
Population: An entire group of animals, people, or object belonging to a particular category (for example, all college students or all married women) .
Sample: A smaller subpart of a population.
Representative sample: a small, randomly selected part of a larger population that accurately reflects characteristics of the whole population.
Random selection: Choosing a sample so that each member of the population has an equal chance of being included in the sample.
Statistical significance: The degree to which an event (such as the results of an experiment) is unlikely to have occurred by chance alone.