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# Psychology Chapter 2

Term | Definition |
---|---|

Self-fulfilling prophecy | A situation in which a researcher's expectations influence that person's own behavior, and thereby influence the participant's behavior |

Single-bind experiment | An experiment in which the participants are unaware of which participants received the treatment |

Double-blind experiment | An experiment in which neither the experimenter nor the participants know which participants received which treatment |

Placebo effect | A change in a participant's illness or behavior that results from a belief that the treatment will have an effect, rather than the actual treatment |

Statistics | The branch of mathematics concerned with summarizing and making meaningful inferences from collections of data |

Descriptive statistics | The listings and summarizing of data in a practical, efficient way |

frequency distribution | an arrangement of data that indicates how often a particular score or observation occurs |

Normal curve | A graph of frequency distribution shaped like a symmetrical, bell-shaped curve; a graph of normal distribution |

Central tendency | a number that describes something about the "average" score of a distribution |

Variance | A measure of difference, or spread |

Standard deviation | A measure of variability that describes an average distance of every score from the mean |

Correlation coefficient | Describes the direction and strength of the relationship between two sets of variables |

Inferential statistics | numerical methods used to determine whether research data support a hypothesis or whether the results were due to chance |