The median is one of the most commonly used measures of variability.
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Q. 2The Central Limit Theorem can only be applied to large samples when the data provide a strong indication of a unimodal distribution that is approximately symmetric.
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Q. 3A parameter and statistic can be used interchangeably.
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Q. 4The variability of a statistic is measured by the standard deviation of its sampled population.
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Q. 5Measures of variability are numbers that indicate the spread or scatter of observations; they show the extent to which individual values in a data set differs from one another and, hence, differ from their central location.
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Q. 6The sample mean, , is the point estimate (single number value) for the mean of the sampled population.
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Q. 7The sum of the deviations squared from the mean is always zero.
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Q. 8If the maximum error E is expressed as a multiple of the standard deviation , then the actual value of is not needed in order to calculate the sample size.
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