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# IED 1.3

### PLTW IED 1.3 Vocabulary Words and Terms to Know

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

Data Set | A group of individual values or bits of information that are related in some way or have some common characteristic or attribute. |

Dimension | A measurable extent, such as the three principal dimensions of an object is width, height, and depth. Length and thickness are not used because they cannont be applied in all cases. |

Dimension Lines | Lines that are thin lines capped with arrowheads, which may be broken along their length to provide space for the dimension numerals. |

English System | Also referred to as the U.S. Customary system. The measuring system based on the foot, second, and pound as units of length, time, and weight or mass. |

Extension Lines | Thin lines used to establish the extent of a dimension. Extension lines begin with a short space from the object and extend to about .125 inches past the last dimension line. |

Foot | A unit of linear measure equal to 12 inches or 30.48 cm. |

Frequency | The rate at which something occurs over a particular period or in a given sample. |

Graph | A diagram showing the relation between variable quantities, typically of two variables measured along a pair of lines at right angles. |

Histogram | A graph of vertical bars representing the frequency distribution of a set of data. |

Inch | A unit of linear measure equal to one twelfth of a foot or 2.54 cm. |

International Organization for Standardization (ISO) | A non-governmental global organization whose principal activity is the development of technical standards through consensus. |

Mean | The average or central value of a set of quantities. |

Measure | To determine the size, amount, or degree of something by comparison with a standard unit. |

Median | Referring to the middle term or mean of the middle two terms of a series of values arranged in order of magnitude. |

Meter | The fundamental unit of length in the metric system, equal to 100 centimeters or approximately 39.37 inches. |

Metric System | The decimal measuring system based on the meter, liter, and gram as units of length, capacity, and weight or mass. |

Millimeter | A metric unit of linear measure equal to 1/1000 of a meter. |

Mode | The value that occurs most frequently in a given data set. |

Normal Distribution | A function that represents the distribution of variables as a symmetrical bell-shaped graph. |

Numeric Constraint | A number value, or algebraic equation that is used to control the size or location of a geometric figure. |

Precision | Exact in measuring, recording, etc. |

Scale | 1. A straight-edged strip of rigid material marked at regular intervals and used to measure distances. 2. A proportion between two sets of dimensions used in developing accurate, larger or smaller prototypes, or models of design ideas. |

Standard | Something considered by an authority or by general consent as a basis of comparison. |

Statistics | Collection of methods for planning experiments, obtaining data, organizing, summarizing, presenting, analyzing, interpreting, and drawing conclusions based on data. |

Two-Dimensional | Having the dimensions of height and width, height and depth, or width and depth only. |

Unit | A standard quantity in terms of which other quantities may be expressed. |

Variation | A change or slight difference in condition, amount, or level. |