Summary of Horsepower Count 38 Mean 101.7 Median 100 StdDev 26.4 Range 90 25th %tile 78 75th %tile 125 * 2 1 60 100 150 # of Cars
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.
monly used to describe auto engines. Here are the sum-
mary statistics and histogram displaying horsepowers of
distribution.
b) What is the
power? Explain.
horsepower of auto engines? Explain.
e) From the histogram, make a rough estimate of the
percentage of these engines whose horsepower is
within one standard deviation of the mean.
f) A fuel additive boasts in its advertising that it can
“add 10 horsepower to any car.” Assuming that is
true, what would happen to each of these summary
statistics if this additive were used in all the cars?
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