The side-by-side dotplot below displays the arm spans, in centimeters, for two classes. Which statement is NOT true? O The mean arm span appears to be similar for the two Arm Span (cm) Class A Class B classes. 8 31 965 14 The arm spans for Class A have less variability than the arm spans for Class B. 15 56 022233 5 67 0 3 The arm spans for Class B have more variability than the arm spans for Class A. 421 16 995 17 9965 16 1 0 The arm spans for Class A are roughly symmetric, while those for Class B are skewed left. 17 3 20 012 18 66 18 19 19 20 182 55 OCO77 ∞ o o C
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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