37 terms

# Mr. P's Algebra 1-2 ch. 13 vocab

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Population
Every individual or element for which data is needed.
Sample
A portion of the larger group or population selected to represent the entire population.
Census
When every individual or element in the population is counted in the recorded data.
RANDOM SAMPLE (aka UNBIASED SAMPLES)
A sample that is chosen without any member or element in the population being favored or shown preference.
BIASED SAMPLES
One or more of the members or elements of the population are favored to be chosen over the others.
Convenience Sample
Choosing members of a population that are easy to access.
Voluntary Response Sample
Members of the population volunteer to participate and be a part of the sample.
Histogram
A bar graph that has its data organized into equal intervals.
Median
The middle number in an organized set of data.
Mean
The average number in a set of data.
Mode
The number that occurs the most often in a set of data.
Measures of Central Tendency
Mean, Median, and Mode.
Measures of Variation
Measures that describe the spread values in a set of data.
Range
The difference between the greatest and least numbers in a set of data.
Quartiles
The values that separate the data into four equal subsets.
Q1 (Lower Quartile)
It divides the lower half of data into two equal parts.
Q2 (Median)
It divides all of the data into two equal parts.
Q3 (Upper Quartile)
It divides the upper half of data into two equal parts.
IQR (Interquartile Range)
The difference between the upper and lower quartiles.
Outliers
A value that is much less or much greater than the rest of the data.
Q1
Lower Quartile.
Q2
Median.
Q3
Upper Quartile.
IQR
Interquartile Range.
Simple Random Sample
Every element or member in the population has an equal chance of being chosen.
Stratified Random Sample
The population is first divided to similar, NONOVERLAPPING groups. A SRS is then taken from each group.
Systematic Random Sample
Members of the sample are chosen at a specific time or item (number) interval.
4 ways to collect data
Published newspaper, observational study, experiment, and survey
What a frequency table is used for
to tally the frequency of events before the histogram is made.
Frequency
The number of elements in a measurement class. It is written along the vertical axis.
Measurement Classes
Equal intervals which are written along the horizontal axis of the graph.
MATRIX
A rectangular arrangement of numbers in rows and columns.
DIMENSIONS OF A MATRIX
Is described as the number of rows in the matrix by the number of columns
ELEMENT
Each entry in the matrix is known as an element
POSITION OF AN ELEMENT
Is given by the element's row and column location.
Lower Outlier
Q1-1.5(IQR)
Upper Outlier
Q3+1.5(IQR)