PSYC 201W Lecture Notes - Lecture 11: Bar Chart, Statistical Inference, Descriptive Statistics
30 Nov 2016
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If you have frequency data you can give a %. Doesn"t make sense if people are not involved altogether. Roughly the average amount that individual scores deviate from the mean: sd & the normal curve: sd has greatest meaning when distribution is normally distributed, normal distribution: a distribution that follows 68, 95, 99. 7 percent rule. Rule stating % of cases falling within 1,2, and 3 sd from mean on a normal distribution. The difference between 2 means in sd units. Small, medium, and large effect sizes are indicated by values of at least . 2, . 5, and . 8 respectively. E. g. college student data set [canvas: relationships among variables: type, bivariate relationships (two variables): plot the pair of scores on a. Positive or direct - if one gets bigger, the other value gets bigger as well. Negative or inverse - as values on 1 variable get bigger, values on the other get smaller. Negative correlation: strength (magnitude) & direction.
