Data was collected for 166 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 160 – 179 66 180 – 199 11 200 – 219 14 220 – 239 53 240 – 259 22 What is the class width for this GFDT? Class width =
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.
Data was collected for 166 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 |
|---|---|
| 160 – 179 | 66 |
| 180 – 199 | 11 |
| 200 – 219 | 14 |
| 220 – 239 | 53 |
| 240 – 259 | 22 |
What is the class width for this GFDT?
Class width =
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