PS101 Lecture Notes - Lecture 5: Peripheral Nervous System, Autonomic Nervous System, Null Hypothesis
Document Summary
Raw score are interesting but tell us nothing unless we know the range of score. Once we have the range we can calculate a range of distribution or distribution curve. Most of our characteristics are polygenetically inherited. Biased test will give us abnormal distributions. If not a normal curve the mean median and mode will all be very different. Add together and divide by four we get 40. Divide by number of points to find the standard deviation: or most marks at one point. Standard deviation - what extent your score deviated from the mean. Square the difference between your score and the mean. Z-score (look up) always a multiple of that standard deviation. Null hypothesis there is no significant difference between two groups in terms of their performance. Findings are statistically significant at the 0. 1 level or the 0. 5 level. Chance does not play a significant role in our findings if they are statistically significant.
