Assume the IQ scores in a population are normally distributed with a mean value of 100 and a standard deviation of 15. Compute the proportion of people in the population for each of the following ranges of IQ scores. The answer should include hand calculations of z-scores involved.a. less than 85b. higher than 118c. between 85 and 133d. between 97 and 115
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.
Assume the IQ scores in a population are normally distributed with a
a. less than 85
b. higher than 118
c. between 85 and 133
d. between 97 and 115
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