PSYC 1200 Lecture Notes - Null Hypothesis, Standard Deviation, Central Tendency

• School: University of Manitoba
• Department: Psychology
• Course: PSYC 1200
• Professor: Jason Leboe- Mcgowan

Document Summary

Descriptive statistics - summarize large sets of results using central tendency. Range - subtract the lowest score from the highest score. The higher the standard deviation is, the greater the variability among the scores. Steps for finding standard deviation: calculate mean, calculate different between each score and mean, then square them, add squared differences together, divide by number of scores, take square root of that value. Null hypothesis - statement saying the manipulated independent variable (iv) will not have an effect on the dependent variable (dv) Alternative hypothesis - statement saying the manipulated independent variable will have an effect on the dependent variable. Issue is whether difference is large enough to warrant: rejection of null hypothesis, acceptance of alternative hypothesis. If the null hypothesis is true and the experiment is run an infinite number of times there should be a normal distribution with a mean of 0.