# Definition classification it is the process of

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Chapter P / Exercise 1
Algebra and Trigonometry: Real Mathematics, Real People
Larson
Expert Verified
Definition Classification It is the process of analyzing data into sequences and groups to their common characteristics. Example The number of students registered in KEMU during the academic year 2005/2006 may be classified on the basis of any of the following. Gender Province Facilities Courses Age/year Height/weight. 15
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Chapter P / Exercise 1
Algebra and Trigonometry: Real Mathematics, Real People
Larson
Expert Verified
Functions of Classifications 1. Condenses data. 2. facilitates comparison (compare different groups) 3. Helps to study the relationships. 4. Facilitates statistical treatment of data. Rules of classification 1. Should be unambiguous – clear and stable. 2. Should be exclusive and mutually exclusive. 3. Should be suitable for the purpose. Bases when classifying a) Geographical With respect to area or region. b) Chronological With respect to occurrence of time. c) Qualitative With respect to some character/groups d) Quantitative With respect to numerical values or negritude. Data Tabulation Definition A frequency distribution is the organization of rate data in table form using classes and frequencies. Frequency is the number of values in a specified class. There are 2 different types of frequency distribution. 1. Discrete or ungrouped Frequency distribution. 16
Formed by tallying all the values in the data. I.e noting the times a particular value is repeated. Then the tally/tallies are counted and recorded against the corresponding value in another column. Example supposes a researcher wished to do a study n the number of miles the students travel on campus each day. Suppose a researcher wishes to do a study n the number of miles the students travel on campus each day. 1 2 6 7 12 13 2 6 9 5 1 7 3 15 15 4 17 1 14 15 4 16 4 5 8 6 15 18 15 2 9 11 12 1 9 2 10 11 4 10 9 18 8 8 4 14 7 3 2 6 NB: The original form of data can give very little information by looking at it. Solution Form a frequency dimension table. Mileage Tally Frequency 1 /// 3 2 /// 5 3 // 2 4 //// 5 5 //// 4 6 //// 4 7 /// 3 8 /// 3 9 //// 4 10 // 2 11 // 2 12 // 2 13 / 1 14 // 2 17
15 // 2 16 / 1 17 / 1 18 // 2 Remark It is a better way of presenting data but still it does not condense the data much. The ungrouped frequency distribution is quite handy if Values of the variables are largely repeated. Variable under consideration takes only a few values. Grouped frequency distribution It is formed by dividing the entire range of the values of the variable into a suitable number of groups. Then the number of observations in each group is recorded. Definition The various groups in which the values of the variables are divided are known as classes or class intervals. e.g. 1 – 3, 4 – 6 . Definition The two values specifying the class are called class limits:- the bigger value is upper class limit. The smaller value is the lower class limit. e.g, 1(lower class limit) – 3 (lower class limit) Definition The number of values specified in a given class interval is called its length or width or magnitude.