1.8 2.3 6.7 11.3 16.7 25.2 26.9 27.9
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.
Calculate the 25th percentile of the data shown
| x |
|---|
| 1.8 |
| 2.3 |
| 6.7 |
| 11.3 |
| 16.7 |
| 25.2 |
| 26.9 |
| 27.9 |
Percentile is the value in the data below which certain percentage of the data lie.
For computing the percentile following steps are followed:
1) Arrange the data into ascending order.
2) Obtain the number of observations.
3) Apply the formula to obtain the position of the percentile.
4) Pick the data value from that position.
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