A researcher for the EPA mneasured the amount of arsenic in the water near a sewag treatment plant. Over 12 days, he took n = data is summarized in the frequency distribution polygon shown below. 40 measurements (in ppb). His sample- 25 30 35 40 5 50 55 G0 65 70 75 How many measurements taken in this time frame were less than 60 ppb? ans = 8
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.
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