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Alg1B Unit 8
Descriptive Statistics
| Term | Definition |
|---|---|
| Dot Plot | A chart where each data value is plotted with a point above a horizontal axis. |
| Histogram | A bar graph that displays the distribution of data where the bars touch. The horizontal axis uses numerical values, and the vertical scale measures the frequencies of each class. |
| Bin | A range of values to sort the data into classes or intervals |
| Frequency Table | A table that displays the bins of the data with a count of the number of data values for each bin. |
| Minimum | The least value of a data set. |
| Maximum | The greatest value of a data set. |
| First Quartile | The middle number between the minimum and the median of a list of values that are sorted from least to greatest. |
| Third Quartile | The middle number between the median and the maximum of a list of values that are sorted from least to greatest. |
| Five-Number Summary | The values of a data set—minimum, first quartile, median, third, quartile, and maximum—that can be used to construct a box plot. |
| Median | The middle number of a list of values that are sorted from least to greatest. |
| Interquartile Range | The difference between the first quartile and the third quartile. |
| Mean | The average of a data set, which can be calculated by adding all of the values in the data set and then dividing that sum by the number of terms in the data set. |
| Standard Deviation | The measure of the amount of variation in a data set, which can be calculated using the formula |
| Range | The difference between the minimum and maximum value of a data set. |
| Outlier | A data value that is less than 1.5 times the interquartile range below the first quartile or is greater than 1.5 times the interquartile range above the third quartile. |
| Center | The mean or median of a data set. |
| Spread | The range, the standard deviation, or the interquartile range of a data set. |
| Two-way frequency table | A visual display of the counts of frequencies for two categorical variables. |
| Joint frequency | Entries found in the interior cells (non-total column and row) in a two-way frequency table, which are the counts of data where both variables occur. |
| Marginal frequency | The total of the cells in a row or column for a category of a two-way frequency table. |
| Categorical data | In statistics, categorical data, or qualitative data, can take on one of a limited, and usually fixed, number of possible values, which are assigned to groups based on their properties. |
| Two-Way Relative Frequency Table | A visual display of the relative frequencies for two categorical variables. |
| Joint Relative Frequency | The joint frequency, the counts of data where both variables occur, divided by the total of all outcomes. |
| Marginal Relative Frequency | The marginal frequency, the total value of a category, divided by the total of all outcomes |
| Conditional Relative Frequency | The ratio of a joint relative frequency value and its related relative marginal frequency value. |
| Association | Two variables that are statistically related to one another. |
Created by:
schaffermath
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