The Urban Development Index (UDI) is a standardized measure used to observe and measure the mental development of infants over time. It is approximately normal with mean 90 and standard deviation 12. What proportion of children has UDI of at least 80? Find the MDI score that corresponds to 99th percentile. What proportion of children will have an UDI score of at most 110? What percentage of infants will have an UDI score between 80 and 120?
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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