Number of Active-Duty Gay Servicemembers Discharged from the Military for Homosexuality 1300 (1998, 1163) (2001, 1273) 1200 1100 1000 900 800 (2006, 623) 700 (1994, 617) 600 500 F 400 300 200 100 *94 '95 '96 '97 '98 '99 '00 '01 '02 '03 '04 '05 06 '07 '08 '09 '10 Year Number of Discharged Active- Duty Servicemembers
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 stated intent of the 1994 “don’t ask, don’t tell” policy was to reduce the number of discharges of gay men and lesbians from the military. Nearly 14,000 active-duty gay servicemembers were dismissed under the policy, which officially ended in 2011, after 18 years. The line given graph shows the number of discharges under “don’t ask, don’t tell” from 1994 through 2010.
Use the data displayed by the graph to solve; Find the average rate of change, rounded to the nearest whole number, from 2001 through 2006. Describe what this means.
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