STATISTICAL TECHNIQUES AND TOOLS
MEASURES OF VARIABILITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Determine if the statement as having variability or no variability.Average number of students in a 3rd grade classroom.
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Variability
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No Variability
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -A standard deviation equal to 0 indicates no variance in your data.
Detailed explanation-2: -A simple measure of variability is the range, the difference between the highest and lowest scores in a set. For the example given above, the range of Drug A is 40 (100-60) and Drug B is 10 (85-75). This shows that Drug A scores are dispersed over a larger range than Drug B.
Detailed explanation-3: -Range: the difference between the highest and lowest values. Interquartile range: the range of the middle half of a distribution. Standard deviation: average distance from the mean. Variance: average of squared distances from the mean.
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