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12 explain the scope of statistics 13 what are the

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Unformatted text preview: e the functions of statistics. 12. Explain the scope of statistics. 13. What are the limitations of statistics. 14. Explain any two functions of statistics. 15. Explain any two applications of statistics. 16. Describe any two limitations of statistics. IV. Suggested Activities (Project Work): 17. Collect statistical informations from Magazines, News papers, Television, Internet etc., 18. Collect interesting statistical facts from various sources and paste it in your Album note book. Answers: I. 1. (a) 2. (b) II. 3. State affairs 4. Tabulation 5. Forecasting 6. Analysis of variance (or ANOVA) 10 2. INTRODUCTION TO SAMPLING METHODS 2.1 Introduction: Sampling is very often used in our daily life. For example while purchasing food grains from a shop we usually examine a handful from the bag to assess the quality of the commodity. A doctor examines a few drops of blood as sample and draws conclusion about the blood constitution of the whole body. Thus most of our investigations are based on samples. In this chapter, let us see the importance of sampling and the various methods of sample selections from the population. 2.2 Population: In a statistical enquiry, all the items, which fall within the purview of enquiry, are known as Population or Universe. In other words, the population is a complete set of all possible observations of the type which is to be investigated. Total number of students studying in a school or college, total number of books in a library, total number of houses in a village or town are some examples of population. Sometimes it is possible and practical to examine every person or item in the population we wish to describe. We call this a Complete enumeration, or census. We use sampling when it is not possible to measure every item in the population. Statisticians use the word population to refer not only to people but to all items that have been chosen for study. 2.2.1 Finite population and infinite population: A population is said to be finite if it consists...
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