PSYC 218 Chapter 6: Chapter 6.docx
Document Summary
The nature of the normal curve: normal curve: is symmetrical, unimodal with the mode at the center, the mean, median, and mode all have the same value, it is a asymptotic curve, i. e. it never touches the horizontal axis on either side infinite, two thirds(68. 29%) of scores fall between the mean and +/ 1 sd. The standard normal curve: finding areas when the score is known: to find the area that lies above a certain score, convert raw score to a z score (use formula (score mean)/sd, locate the z score in table a and look at column 3, if you want to find the raw score, multiply column 3 number with total population, to find the area between to scores, first find the z scores for both raw scores, look at column 2 for both and add them together, if you want to find the raw score, multiply the sum of column 2 values by population number.
