Question | Answer |
Stratified samples | the population is first divided into different categories (strata) and the number of members in each category is determined. |
Biased samples | a sample with one or more subgroups 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 | both sides appear to be responding, but the poll may disproportionately represent extreme viewpoints from both sides, while ignoring more moderate opinions that may be the majority view. |
Face to face interview | fewer misunderstood questions, high response rate, additional information can be collected from respondents; time consuming, expensive, can be biased based on attitude/appearance of surveyor. |
Self administered surveys | respondent can complete on their own time, less expensive than face to face interviews, anonymity cause more honest results; lower response rate |
Random samples | everyone in the population has the same chance of being chosen. |
Measure of central tendency | the mean, median, and mode of a set of data |
Frequency distribution table | lists the data values, as well as the number of times each value appears in the data set; used for ungrouped data |
Ungrouped data | data that is listed |
Grouped data | data that is placed in intervals |
Population | the whole group |