The table below shows the number of one company's stores located in each of 50 regions. Complete parts (a) through (c) below. 60 23 76 52 570 81 67 17 11 308 128 21 27 190 129 69 59 78 83 30 97 117 155 83 48 99 26 33 42 35 160 41 345 138 6 204 59 66 232 23 70 24 87 405 40 16 141 115 39 101 What percentage of the 50 regions have stores within ±1, ±2, or ±3 standard deviations of the mean? The percentage within ±1mstandard deviation of the mean is____ %.
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.
The table below shows the number of one company's stores located in each of 50 regions. Complete parts (a) through (c) below.
| 60 | 23 | 76 | 52 | 570 | 81 | 67 | 17 | 11 | 308 |
| 128 | 21 | 27 | 190 | 129 | 69 | 59 | 78 | 83 | 30 |
| 97 | 117 | 155 | 83 | 48 | 99 | 26 | 33 | 42 | 35 |
| 160 | 41 | 345 | 138 | 6 | 204 | 59 | 66 | 232 | 23 |
| 70 | 24 | 87 | 405 | 40 | 16 | 141 | 115 | 39 | 101 |
standard deviations of the mean?
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