A class of sixth-grade students kept accurate records on the amount of time they spent playing video games during a one-week period. The times (in hours) are listed below: 11.7 17.9 18.4 12.9 17.1 15.8 11.3 28.7 18.0 26.4 2. The population standard deviation is represented by ________. 3. The sum of squares for a distribution of scores is given by ________. 4. When extreme values are present in a set of data, which of the following descriptive summary measures are most appropriate?
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.
11.7 17.9 18.4 12.9 17.1
15.8 11.3 28.7 18.0 26.4
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| b |
variance and interquartile range
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| c |
CV and range
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| d |
arithmetic
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