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Population

Every individual or element for which data is needed.

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Sample

A portion of the larger group or population selected to represent the entire population.

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Census

When every individual or element in the population is counted in the recorded data.

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RANDOM SAMPLE (aka UNBIASED SAMPLES)

A sample that is chosen without any member or element in the population being favored or shown preference.

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BIASED SAMPLES

One or more of the members or elements of the population are favored to be chosen over the others.

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Convenience Sample

Choosing members of a population that are easy to access.

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Voluntary Response Sample

Members of the population volunteer to participate and be a part of the sample.

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Histogram

A bar graph that has its data organized into equal intervals.

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Median

The middle number in an organized set of data.

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Mean

The average number in a set of data.

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Mode

The number that occurs the most often in a set of data.

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Measures of Central Tendency

Mean, Median, and Mode.

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Measures of Variation

Measures that describe the spread values in a set of data.

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Range

The difference between the greatest and least numbers in a set of data.

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Quartiles

The values that separate the data into four equal subsets.

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Q1 (Lower Quartile)

It divides the lower half of data into two equal parts.

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Q2 (Median)

It divides all of the data into two equal parts.

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Q3 (Upper Quartile)

It divides the upper half of data into two equal parts.

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IQR (Interquartile Range)

The difference between the upper and lower quartiles.

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Outliers

A value that is much less or much greater than the rest of the data.

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Simple Random Sample

Every element or member in the population has an equal chance of being chosen.

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Stratified Random Sample

The population is first divided to similar, NONOVERLAPPING groups. A SRS is then taken from each group.

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Systematic Random Sample

Members of the sample are chosen at a specific time or item (number) interval.

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4 ways to collect data

Published newspaper, observational study, experiment, and survey

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What a frequency table is used for

to tally the frequency of events before the histogram is made.

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Frequency

The number of elements in a measurement class. It is written along the vertical axis.

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Measurement Classes

Equal intervals which are written along the horizontal axis of the graph.

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MATRIX

A rectangular arrangement of numbers in rows and columns.

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DIMENSIONS OF A MATRIX

Is described as the number of rows in the matrix by the number of columns

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ELEMENT

Each entry in the matrix is known as an element

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POSITION OF AN ELEMENT

Is given by the element's row and column location.

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Lower Outlier

Q1-1.5(IQR)

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Upper Outlier

Q3+1.5(IQR)

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