METHODS OF DATA ANALYSIS
MEASURES OF CENTRAL TENDENCY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Divide the sum of all the product of frequency and class mark by the total frequency.
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Multiply the frequency by the class mark for each class. Place them in another column.
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Compute for the lower class boundary of the class with the highest frequency.
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Find the midpoint (class mark) of each class . Place them in a column.
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Detailed explanation-1: -Mode of grouped data Step 1 – First, we will identify the modal class. Modal class is the class that has the highest frequency. Step 3 – Then, we will find the value of h, which is the size of the class interval, and can be calculated by using the formula, upper limit – lower limit.
Detailed explanation-2: -In statistics, the assumed mean method is used to calculate mean or arithmetic mean of a grouped data.
Detailed explanation-3: -The median for grouped data is given by the equation, median = [l + ((n/2) – cf)/f)h ], where cf is the cumulative frequency, l is the lower limit of median class, n is the number of observations, f is the frequency of median class, h is the class size (assuming equal size classes).