Titlebook: Statistical Methods in Medical Research; Charan Singh Rayat Book 2018 Springer Nature Singapore Pte Ltd. 2018 Student’s ‘t’ test.‘t’-paire

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Graphic Presentation of Data,cise, whereas diagrams are generally used for the purpose of publicity and propaganda. Relationship between two variables can be studied by graphs. These can be drawn more easily than diagrams. Graphs are considered very useful for studying time series and frequency distribution.

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Measures of Dispersion,on is not adequately described by knowing the measure of central tendency alone. Absolute dispersions are expressed in the units the measurements are made, whereas relative dispersion is a pure number expressed as a ratio or percentage. Dispersion is also expressed by fluctuation, spread, scatter, o

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Tests of Significance,tatistical decision.” Contesting the null hypothesis (..) without any bias is essential. Accepting or rejecting the .. illogically would lead to erroneous decisions. One-tailed or two-tailed tests are generally applied depending on the scope and requirement of given data. One-tailed test is applied