Data was collected for 229 randomly selected 10 minute intervals. For each ten-minute interval, the number of people entering the atrium of a large mall were recorded. The data is summarized in the table below. Number of Guests Frequency 60 – 69 92 70 – 79 93 80 – 89 15 90 – 99 19 100 – 109 10 What is the class width for this GFDT?
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.
Given:
- Data was collected for 229 randomly selected 10 minute intervals.
The Guest Frequency Distribution Table is,
| Number of guests | Frequency |
| 60-69 | 92 |
| 70-79 | 93 |
| 80-89 | 15 |
| 90-99 | 19 |
| 100-109 | 10 |
The objective is to find the class width for this Guest Frequency Distribution Table
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