4. A psychologist has a run a between-subjects experiment comparing two treatments for depression: Cognitive-Behavioral Therapy (CBT) and Client- Centered Therapy (CCT) against a control condition. Subjects were randomly assigned to the experimental condition. After 12 weeks, the subject's depression scores were measured using the CESD depression scale. The higher the score, the more depressed. Determine if the therapy worked. The data are summarized as follows: Control CBT CCT 40 21 10 38 17 17 37 19 15 40 16 16 4. A psychologist has a run a between-subjects experiment comparing two treatments for depression: Cognitive-Behavioral Therapy (CBT) and Client- Centered Therapy (CCT) against a control condition. Subjects were randomly assigned to the experimental condition. After 12 weeks, the subject's depression scores were measured using the CESD depression scale. The higher the score, the more depressed. Determine if the therapy worked. The data are summarized as follows: Control CBT CCT 40 21 10 38 17 17 37 19 15 40 16 16
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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