PSYC 2000 Lecture 2: Chapter 2
Document Summary
Frequency- count the number of times that score of x appears. Cumulative frequency- adding the frequencies from bottom to the top of collective amount of frequencies. Top number of cumulative frequency should always be n. Can only answer with confidence if it is first or last number not in between there. Interval size- how many score values in each interval. Do this until the entire range is covered. Lowest score of each interval should be multiple of interval size. Ex. interval of 3, the number 3 goes into the lowest number. Real limits- suitable when x is fractional (has decimals) Apparent limits- suitable when x is an integer. In order to go from apparent real you subtract . 5 from the lowest limit and add . 5 to the highest limit. Percentile rank- percent of cases in the data scoring at or below that score.
