PSYC 1010 Lecture Notes - Lecture 4: Statistical Inference, Perception, Descriptive Statistics

• School: York University
• Department: Psychology
• Course: PSYC 1010
• Professor: Rebecca Jubis

Document Summary

: measure the average spread of scores among the mean (deviation) which. Standard deviation takes into account all scores and not just the highest+lowest. All statistics can be divided into two types: descriptive statistics and inferential statistics. : provide us with a way of determining how much confidence we can have in results obtained from samples . By telling us how likely it is that results are only due to chance. Real = true of the population = statistically significant. The probability level = p =. 05 (psychologists arbitrarily picked to mean that dividing point). l. 0. 5 p>0. 5 then results are due to chance would not find this if you tested the whole population. p<=0. 5 then results are statistically significant they are real, you would find it if you tested the entire population. The only way you know the conclusion of your assumption is if you"re testing the whole population to know 100% for sure, but that"s impossible!