bus-stat-book1

3 the starting point ie the lower limit of the first

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Unformatted text preview: tc. 3. The starting point i.e the lower limit of the first class, should either be zero or 5 or multiple of 5. 4. To ensure continuity and to get correct class interval we should adopt “exclusive” method. 5. Wherever possible, it is desirable to use class interval of equal sizes. 56 4.6 Preparation of frequency table: The premise of data in the form of frequency distribution describes the basic pattern which the data assumes in the mass. Frequency distribution gives a better picture of the pattern of data if the number of items is large. If the identity of the individuals about whom a particular information is taken, is not relevant then the first step of condensation is to divide the observed range of variable into a suitable number of class-intervals and to record the number of observations in each class. Let us consider the weights in kg of 50 college students. 42 62 46 54 41 37 54 44 32 45 47 50 58 49 51 42 46 37 42 39 54 39 51 58 47 64 43 48 49 48 49 61 41 40 58 49 59 57 57 34 56 38 45 52 46 40 63 41 51 41 Here the size of the class interval as per sturges rule is obtained as follows Range Size of class interval = C = 1+3.322 logN 64 - 32 32 = = 5 1+3.322 log(50) 6.64 Thus the number of class interval is 7 and size of each class is 5. The required size of each class is 5. The required frequency distribution is prepared using tally marks as given below: Class Interval Tally marks Frequency 30-35 2 35-40 6 40-45 12 45-50 14 50-55 6 55-60 6 60-65 4 Total 50 57 Example 2: Given below are the number of tools produced by workers in a factory. 43 40 34 33 28 31 32 23 21 22 18 25 18 39 44 19 20 20 26 45 38 25 13 14 27 41 42 17 31 32 27 33 37 25 26 32 25 34 35 46 29 34 31 34 35 24 30 41 32 29 28 30 31 30 34 35 36 29 26 32 36 35 36 37 23 22 29 33 37 33 27 24 36 42 29 37 29 23 44 41 45 39 21 42 22 28 22 15 16 17 28 29 35 31 27 40 23 32 40 37 Construct frequency distribution with inclusive type of class interval. Also find. 1. How many workers produced more than 38 tool...
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This note was uploaded on 01/18/2014 for the course BUS 100 taught by Professor Moshiri during the Winter '08 term at UC Riverside.

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