| A | B |
|---|
| measure of central tendency | summary score that represents a set of scores |
| mode | the score that occurs most frequently |
| median | 50% of scores fall below; 50% of scores fall above |
| mean | dividing the total sum of the scores by the number of scores |
| A distribution of scores can... | ...have one or more modes. |
| An exact median can always... | be calculated, even if the calculations are lengthy. |
| symbol for the population mean | ยต |
| symbol for the sample mean | X with a bar across the top |
| The measure of central tendency which is used the most is... | the mean. |
| If a score in the distribution is unknown, the mean can be used to... | estimate that score. |
| The mode can be used with... | nominal, ordinal, interval, and ratio scales. |
| The median can be used with... | ordinal, interval, and ratio scales. |
| The mean can be used with... | interval and ratio scales. |
| The mean is not appropriate when... | scores are extreme because it will be skewed. |
| The mode and the median are most often used for... | descriptive statistics. |
| A weighted mean is computed when we want to find the overall mean... | of two or more combined groups. |
| The weighted mean takes into consideration... | different group sizes and different means. |
