Professor Wonka is interested in whether candy influences children's mood. One group of children is recruited to be part of an experimental group, and another group of children is recruited to be part of the control group. Participants in the experimental group each eat 1 candy bar and then report on their mood on a self-report questionnaire. Children in the control condition do not eat anything before reporting on their mood. Here are the data from the two groups: Experimental (candy) group 15 18.3 94.6 n= M= SS= Control group 17 14.5 112.8 Calculate the effect size in terms of the n= M= SS= proportion of variance accounted for (r-).
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
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