Applied Statistical Methods in Agriculture, Health and Life by Bayo Lawal

By Bayo Lawal

This textbook teaches an important statistical the right way to solution examine questions utilizing a special diversity of statistical software program courses, together with MINITAB and R. This textbook is constructed for undergraduate scholars in agriculture, nursing, biology and biomedical study. Graduate scholars also will locate it to be an invaluable technique to refresh their statistics talents and to reference software program thoughts. the original mix of examples is approached utilizing MINITAB and R for his or her person strengths. matters coated contain between others facts description, likelihood distributions, experimental layout, regression research, randomized layout and organic assay. in contrast to different biostatistics textbooks, this article additionally comprises outliers, influential observations in regression and an advent to survival research. fabric is taken from the author's huge instructing and learn in Africa, united states and the united kingdom. pattern difficulties, references and digital supplementary fabric accompany each one chapter.

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Do we ever bother to ascertain the accuracy of the scales used? A few years ago, a research organisation checked the scales used for weighing heavy objects; the scale was found to weigh low for relatively light objects. This would mean that the differences in weight between heavy and medium, heavy and light, and medium and light objects were smaller than they should have been. The error in measurement of weights could have led to erroneous conclusions. A simple check would have revealed this error which had gone undetected for an unknown length of time.

These questionnaires are constructed by people who often forget one simple fact and that is—if the person being interviewed does not understand the question and an answer is given, the answer might as well has been generated by a random or chance process. Application forms represent another form which attempts to obtain information about individuals for University admission, job application, etc. Often these forms are very brief, but occasionally, the inventor of forms becomes a little too enthusiastic.

1 The Mean, x¯ The sample mean or average of a set of n measurements x1 , x2 , · · · , xn is the sum of these measurements divided by n. The mean is denoted by x ¯ and is expressed as: x ¯= xi n Examples (1) Given the heights in inches of five men as 66, 73, 68, 69, and 74. , x ¯ = 70 inches. 8. 4 We can see that the mean is a good summary figure. About half of the readings are smaller than the mean and half larger. Even when the mean is not a good summary figure, it generally provides a useful mental or visual focus when looking at the data.

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