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Mathematical Expectations** |
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: ** |
The sum of the products of values of a variable and their respective probabilities |

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Measures of Central Tendency** |
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The descriptive measures which indicate the centered values of a set of observations. |

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Measure of variation** |
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It is the descriptive measures which points out the spread of values in a set of values. |

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Median (Q2)** |
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The value or the size of the central item of the arranged data or the middle i.e. 50th percentile of the ordered distribution. |

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Mode** |
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It is the size of the item which occurs most frequently in a distribution. |

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Mutually Exclusive** |
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Outcomes such that the occurrence of one preclude the occurrence of the other. |

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Moments** |
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: ** |
The arithmetic mean of the various powers of the deviations in any distribution. |

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Negative Relationship** |
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In a relationship between two variables when one increases the other decreases or vice - versa. |

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Nominal** |
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A scale using numbers, symbols, or titles to designate the different sub-class. |

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Normal Distribution** |
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: ** |
It is the limiting form of the binomial distribution when the number of trials is very large and the probability of success and failure is very small. |

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Non-parametric Test** |
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: ** |
Statistical test used, when the population cannot be assume to be normal or when the level of measurements is ordinal or less. |

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Null- Hypothesis** |
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The opposite or reverse of the researcher's hypothesis. |

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Ogive** |
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A graphic representation, that displays a running total. |

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One-Tail Test (One sided Test)** |
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A test that predicts that one value is higher than the other. |

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Ordinal** |
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: ** |
It is a scale which uses numbers or symbols to rank the intervals are unspecified. |

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Out-lier** |
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: ** |
The points of the data, that fall far away from most of the other points of the data. |

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Parameter** |
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: ** |
A characteristic of population. |