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DQ5 - Essay Example

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It includes mean, media and mode. Mean is the most familiar average. Many people use this measure as it is easy to calculate and gives very close to accurate answer…
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Download file to see previous pages If the data has some extreme values, then median becomes the most accurate measure of central tendency. However, one weakness of median is that it cannot be applied to raw-data and the data has to arranged in ascending or descending order. This indicates that this measure is time consuming and when data is very large it is very difficult to first arrange it in ascending order and then arrive at median. Mode is considered appropriate for nominal data and can be calculated very easily by observation. There are no calculations required when computing mode and hence it is very quick. The only disadvantage with mode is that it gives the least accurate answer and hence people do not use it despite it being the easiest measure of center or central tendency.
Measures of dispersion describe the spread of data. Some of these measures include range, variance and standard deviation. It includes measures such as range, standard deviation and variance. The advantage of range is that it is very simple and tells you the spread of data. However, since it is dependent on just two values, the answer is not the fairest representation of the distribution. Another very important measure of dispersion is standard deviation. Since it includes all the values of the observation it is most likely to give a good and accurate answer. But, as the numbers are squared in computing standard deviation, the extreme values get more weightage and answer is distorted. Similarly, variance is another good measure as it includes all the values in a observation. The only weakness of variance is that it is very time consuming as each observation has to be squared.
The number of observations that fall into a particular class is call the frequency or count of that class. Frequency distribution is a table that lists all class and their frequencies in a systemized manner. This table tells us at a glance that how many times a particular observation has been seen in our ...Download file to see next pagesRead More
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