The State Traffic Engineer’s office recorded the number of accidents reported in the state on 40 winter days: Determine the median and quartile values of this data set. Draw a box-and-whisker plot for these data. Draw a cumulative frequency diagram for the data in problem 1. Use it to estimate the probability that 200 or more accidents will occur on any winter day.
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 State Traffic Engineer’s office recorded the number of accidents reported in the state on 40 winter days:
- Determine the
median andquartile values of this data set. - Draw a box-and-whisker plot for these data.
- Draw a cumulative frequency diagram for the data in problem 1. Use it to estimate the probability that 200 or more accidents will occur on any winter day.
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