38. Parking lots A survey of autos parked in student and staff lots at a large university classified the brands by country of origin, as seen in the table. Driver Student Staff American 107 105 European 33 12 Asian 55 47 a) What percent of all the cars surveyed were foreign? b) What percent of the American cars were owned by students? c) What percent of the students owned American cars? d) What is the marginal distribution of origin? e) What are the conditional distributions of origin by driver classification? f) Do you think that the origin of the car is independent of the type of driver? Explain. Origin
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.
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