Suppose IQ scores in your community are normally distributed with a mean of 102 and a standard deviation of 11. The z-score tells you how many units above the average (if Z-score is positive) or below the average (if Z- score is negative) any IQ score is. Find the IQ score that corresponds to the following z-scores. Use the formula Z where u is the mean, o is the standard deviation, and X is the IQ score. а. Z — 2.52, х b. Z: 2.52, X =
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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