Example: You are working for the Transport manager of a large chain of supermarkets which hires cars for the use of its staff. Your boss is interested in the weekly distances covered by these cars. Mileages recorded for a sample of hired vehicles from 'Fleet l' during a given week yielded the following data: 138 164 150 132 144 125 149 157 161 150 146 158 140 109 136 148 152 144 145 145 168 126 138 186 163 109 154 165 135 156 146 183 105 108 135 153 140 135 142 128 Q1. Construct a frequency distribution. Q2. Construct steam and leaf plot. Q2. Construct histogram and ogive curve.
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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