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36 Questions around this concept.
In a frequency distribution, the mean and median are 21 and 22 respectively, then its mode is approximately
Which of the following is a measure of central tendency that is affected by extreme values in a dataset?
Which of the following is a statistical software program commonly used for data analysis and visualization?
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Some Important Points Regarding Statistics
where,
are the means and are the standard deviations of two series.
6. Z-Score Formula: It is a method to compare test results from a normal distribution.
For a random variable (x) from a normal distribution with mean and standard deviation , the Z-score can be determined by subtracting the mean from x and then dividing by the standard deviation.
Where x is a test value
is the mean and
is the standard deviation (SD).
For the average of a sample of size (n) from a population, the standard deviation is and the mean is .
Relation between Mean, Mode and Median
If the distribution is symmetric, the value of mean, mode and median coincide. In symmetric distribution, frequencies are symmetrically distributed on the both side of the center point of the frequency curve.
Distribution which are not symmetric is called a skewed-distribution.
The empirical relation between mean, mode and median in such distributions is:
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