A standardized memory test has a mean of μ=100 and a standard deviation of σ = 10. Answer the following questions. A. what proportion of people would score below 89 on the memory test? b. what is the percentile rank for someone who scored a 113 on the memory test? c. what are the scores that separate the middle 28% (14% on each side of the mean)? d. what percent of individuals would score between 85 and 109
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.
A standardized memory test has a mean of μ=100 and a standard deviation of σ = 10. Answer the following questions.
A. what proportion of people would score below 89 on the memory test?
b. what is the percentile rank for someone who scored a 113 on the memory test?
c. what are the scores that separate the middle 28% (14% on each side of the mean)?
d. what percent of individuals would score between 85 and 109
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