The number of calls from motorists per day for roadside service was recorded for the month of December 2016. The results were as follows: 45 168 82 87 83 160 129 188 127 133 115 99 70 161 124 107 39 88 137 46 60 189 176 82 55 76 127 70 51 96
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.
- The number of calls from motorists per day for roadside service was recorded for the month of December 2016. The results were as follows:
|
45 |
168 |
82 |
87 |
83 |
160 |
129 |
188 |
127 |
133 |
|
115 |
99 |
70 |
161 |
124 |
107 |
39 |
88 |
137 |
46 |
|
60 |
189 |
176 |
82 |
55 |
76 |
127 |
70 |
51 |
96 |
Set up a frequency table of 6 classes for this set of data values.
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