Your friend creates a test for creativity. She reports that it has a reliability of +.20 and a validity of +.60. What do you tell her about her findings? You are too creative with your statistics because you can't have a test that is more valid than it is reliable. You have reasonable validity, but you need to revise the test to get it to be more reliable. O You must have a "restriction of range" that has lowered the reliability score. Wait-we don't examine correlation coefficients in building useful tests.
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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