The following values represent the nitrate concentrations in amalgam per liter for 24 samples taken from a specific section of the Tigris River for several months: 51.67.63,60,75,9491,93,87,56,23,108,72.62.35,36,15.33,12,100,102,103, 73,61. A- Organize a frequency distribution table explaining each of the limits of the classes, their frequency, mid class and class boundary limits, so that the limits of the first Class are 10-19 B- Draw the histogram C- What is the number of samples in which the nitrate concentration does not exceed 30 mg / liter? What is the number of samples in which the nitrate concentration is less than 100 mg / liter and more than 60 mg/ liter?
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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