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Statistics Vocab.

Statistics Vocab. for math

Population The whole group
Stratified samples A method actively seeking to poll people from many different backgrounds
Biased Samples If the sample ends up with one or more sub-groups that are either over-represented or under-represented
Cherry Picking The practice of polling only those who you believe will support your cause
Non-response bias A survey that is simply handed out gains few responses when compared to the number of surveys given out
Self-selected sample Self-selected respondents who tend to have stronger opinions on subjects than others and are more motivated to respond may also cause bias
Face to face interviews Fewer misunderstood questions, high response rate, additional information can be collected from respondents, time-consuming, expensive, can be biased based upon the attitude or appearance of the surveyor
Self-administered surveys Respondent can complete on his or her free time, less expensive than face-to-face interviews, anonymity causes more honest results, lower response rate
Random Samples Method in which people are chosen “out of the blue", everyone in the population must have the same chance of being chosen
Measure of central tendency Values that describe the center of a distribution
Frequency distribution table Lists the data values, as well as the number of times each value appears in the data set
Ungrouped data Data that is listed
Grouped data Data that is placed in intervals