Construct both an ungrouped and a grouped frequency distribution for the data given below: 139 130 128 134 140 139 136 130 136 128 138 137 134 128 127 136 140 132 141
Sorry to disappoint you but I will just give you directions to do it yourself.
First sort the data in ascending order (from lowest to highest value)
Create a two-column table
In the first column enter a data value.
In the second column enter the frequency of a data item
Count how many times one particular data value appears in the set (how many repetitions). If it appears only once, its frequency is 1; twice, frequency 2, etc.
For each single (different) data value complete the frequency column.
For grouped data representations you create classes: A class is just an interval of values, for example between [125, 130[
For each class interval you create, count how many data values fall within the interval. For the class given as example it will encompass all values between 125 and 129, It I counted correctly its frequency is 4.
Complete the frequency table for the class.
How many classes should you create? Usually this information is given to you. If not, create a moderate number of classes (4,5) It depends on the span of the distribution (highest value- lowest value). The intervals should have equal length. Read your instructions.
Sep 02, 2012 |
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