The mean of the GRE psychology subject test is 619 (out of 990). The standard deviation is 109. (a) Find the first and third quartiles. Round your answers to the nearest tenth. The first quartile is Answer . The third quartile is Answer (b) What percentage of takers scored between 510 and 728? Answer % (c) What percentage of takers scored between 401 and 619? Answer %
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.
The mean of the GRE psychology subject test is 619 (out of 990). The standard deviation is 109.
(a) Find the first and third
. The third quartile is Answer
(b) What percentage of takers scored between 510 and 728? Answer
%
(c) What percentage of takers scored between 401 and 619? Answer
%
(d) What percentage of takers scored above 728? Answer
%
(e) Suppose I got a 590 on the test. What is my z-score (round to the nearest hundredth)? Answer
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