Weighing trucks II Find a 98% confidence interval of the weight differences in Exercise. Interpret this interval in context.
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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this interval in context.
Exercise
Weighing trucks One kind of scale for weighing trucks can measure their weight as they drive
across a plate. Is this method consistent with the traditional method of static weighing? Are the
conditions for matched pairs inference satisfied? Weights are in 1000s of pounds.
Weight-in-Motion Static Weight Diff (Static – Motion)
26.0
27.9
-1.9
29.9
29.1
0.8
39.5
38.0
1.5
25.1
27.0
-1.9
31.6
30.3
1.3
36.2
34.5
1.7
25.1
27.8
-2.7
31.0
29.6
1.4
35.6
33.1
2.5
40.2
35.5
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