A. The following data scores obtained in an aptitude test of 20 applicants (grouped into two) for a clerical position in a certain company. Group 1. 8, 24, 11, 24, 22, 15, 23, 12, 9, 14 Group 2. 21, 34, 23, 25, 27, 20, 29, 30, 30, 28 Do the following: a. Determine the variance, mean deviation, and standard deviation. b. Which group is more varied in terms of their scores? Why?
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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