Suppose that the scores on a statewide standardized test are normally distributed with a mean of 71 and a standard deviation of 6. Estimate the percentage of scores that were (a) between 53 and 89. % (b) above 89. % (c) below 65. % (d) between 59 and 77.
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.
Suppose that the scores on a statewide standardized test are
(a) between 53 and 89.
%
(b) above 89.
%
(c) below 65.
%
(d) between 59 and 77.
%
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