Array – This is the arrangement of data from the highest to lowest or from lowest to highest.
Range, R - is the difference between the highest and the lowest number.
Number of class- it depends on the size and nature of or class interval distribution. The no. of classes is determined into which the range will be divided. Usually, an effective no. of classes is somewhere between 4 and 20.
No. of classes = range / class size or class width +1
Note:
a.) If series contains less than 50 cases, 10 cases or less are just enough
b.) If series contains 50 to 100 cases, 10 to 15 classes are recommended
c.) If more than 100 cases, 15 or more classes are good
Class Limit – the end number of a class. It is the highest and the lowest values that can go into each class.
Class Size – the width of each class interval
Class Boundaries – are the “true” class limits defined by lower and upper boundaries. The lower boundaries can be determined by getting the average of the upper limit of a class and the lower limit of the next class. They can also be obtained by simply adding of a unit (0.5) to the upper limit and subtracting the same to the lower limit of each class.
Class Mark, M – also known as class Midpoint. It is the average of the lower and upper limits or boundaries of each class.
Class Interval – The range of values used in defining a class. It is simply the length of a class. It is the difference or distance between the upper and lower class boundaries of each class and is affected by the nature of the data and by the number of classes. It is a good practice to set up uniform class interval whenever possible for easier computation and interpretation.
Range, R - is the difference between the highest and the lowest number.
Number of class- it depends on the size and nature of or class interval distribution. The no. of classes is determined into which the range will be divided. Usually, an effective no. of classes is somewhere between 4 and 20.
No. of classes = range / class size or class width +1
Note:
a.) If series contains less than 50 cases, 10 cases or less are just enough
b.) If series contains 50 to 100 cases, 10 to 15 classes are recommended
c.) If more than 100 cases, 15 or more classes are good
Class Limit – the end number of a class. It is the highest and the lowest values that can go into each class.
Class Size – the width of each class interval
Class Boundaries – are the “true” class limits defined by lower and upper boundaries. The lower boundaries can be determined by getting the average of the upper limit of a class and the lower limit of the next class. They can also be obtained by simply adding of a unit (0.5) to the upper limit and subtracting the same to the lower limit of each class.
Class Mark, M – also known as class Midpoint. It is the average of the lower and upper limits or boundaries of each class.
Class Interval – The range of values used in defining a class. It is simply the length of a class. It is the difference or distance between the upper and lower class boundaries of each class and is affected by the nature of the data and by the number of classes. It is a good practice to set up uniform class interval whenever possible for easier computation and interpretation.
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