Based on the frequency distribution table, Commute Distance (miles) Frequency 11 - 15 9 16 - 20 14 21 - 25 12 26 - 30 8 31 - 35 5 36 - 40 2 Round your decimal answers to one decimal place (round to the nearest tenth). (a) Compute the MEAN commute distance for the sample in frequency distribution. Mean commute distance = ___________ miles (b) Compute the Sample STANDARD DEVIATION for the commute distances. Standard Deviation = ___________ miles
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.
Based on the frequency distribution table,
| Commute Distance (miles) | Frequency |
| 11 - 15 | 9 |
| 16 - 20 | 14 |
| 21 - 25 | 12 |
| 26 - 30 | 8 |
| 31 - 35 | 5 |
| 36 - 40 | 2 |
Round your decimal answers to one decimal place (round to the nearest tenth).
(a) Compute the
Mean commute distance = ___________ miles
(b) Compute the Sample STANDARD DEVIATION for the commute distances.
Standard Deviation = ___________ miles
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