# Biostat. Lect 2

rename
alchemist04's
version from
2016-09-21 16:31

## Section

Question | Answer |
---|---|

When extreme score are not present in a data or when you want an average scores of actual numbers, you use what MCT? | Mean |

When an extreme scores are present or when data has a lot of Outliers and the mean may not be helpful, which MCT do you use? | Median |

What else can we learn from MCT (1)? | MCT only describe a part of the sample or population |

What else can we learn from MCT (2)? | Information only describes the "middle" of the sample or population |

What else can we learn from MCT (3)? | you only see a segment of the group |

Question | Answer |
---|---|

T or F? Variability from the mean can occur in either direction | True |

T or F? Distribution can only be affected by very small values or very high values called outliers | True |

T or F? Under normal conditions the mean represents the average values of the sample | True |

Question | Answer |
---|---|

T or F? If a sample truly represents the population, you will expect to have a lot of variation | True |

The difference between the largest data value minus the smallest data value is called? | Range |

A measure of variability between scores around the mean, is called? | Standard deviation |

Highest Score - Lowest Score = | Range |

Variation can be ESTIMATED by calculating Ratio and Standard Deviation, T or F? | True |

Variation, and particularly Standard Deviation, Calculation can only be estimated from Discrete, Ratio, Continuous and Interval data, T or F? | True |

Question | Answer |
---|---|

The median is the 50% percentile of all the scores in a set, T or F? | T |

Median is middle-point of cases, mean is middle point of values, T or F? | T |

Median cannot be used when extreme scores very small or large, T or F? | False |

Question | Answer |
---|---|

A percentile designation of a continuum of 1 - 100% scores is ... | percentiles ( P1, P2......) |

Percent designations of a continuum of 25%, 50%, 75% scores is .... | Quartiles (Q1, Q2, Q3.....) |

Question | Answer |
---|---|

What is the formula for calculating "Range"? | (Maximum value - Minimum value)/2 |

What is the formula for calculating "SD"? | memorize the formula. |

To calculate the "Variation", calculate the SD and square SD, T or F? | True (need to practice this) |

Question | Answer |
---|---|

Why do you use Variability? (1) | (1) we use these values to determine the spread of the data |

Why do you use variability? (2) | (2) measures of central tendency will only tell us where the data centers |

Why do you use Variability? (3) | (3) Measure of variability like SD or VAR will tell us about how spread out the data is. |

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