1. Compute the value of range, mean deviation, quartile deviation, variance, and standard deviation of the given problem. The ages of 12 students in a class are 14, 15, 12, 14 , 17, 18, 15, 16, 19, 13, 16 and 15.
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.
1. Compute the value of
The ages of 12 students in a class are 14, 15, 12, 14 , 17, 18, 15, 16, 19, 13, 16 and 15.
2. Using the data below of 50 students allowance in a day,
| Allowances | Frequency |
| 97-99 | 3 |
| 94-96 | 6 |
| 91-93 | 6 |
| 88-90 | 5 |
| 85-87 | 6 |
| 82-84 | 6 |
| 79-81 | 5 |
| 76-78 | 4 |
| 73-75 | 4 |
| 70-72 | 5 |
| N=50 |
Calculate for:
- Q1
- D6
- P75
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