پاورپوینت روش تحقیق 4

پاورپوینت روش تحقیق 4 (pptx) 26 اسلاید

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تعداد اسلاید: 26 اسلاید

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روش تحقیق 4 Empirical Research Empirical Knowledge based on direct observation Theory Set of ideas which try to explain what we observe Goal is to find support OR disprove We can never prove!! Theoretical diversity The Process of Doing Research First, select a topic Good theory: Has predictive power Is simple & straightforward Then, search the literature Find out what others have done that may be applicable to your area of interest The Process of Doing Research Next, formulate hypotheses Hypothesis: specific statement of expectation derived from theory State the relationship between variables Hypothesis testing is sometimes called confirmatory data analysis, in contrast to exploratory data analysis. Common type of statistical hypotheses Different type of error a) type I error = rejection of H0, when H0 is actually true b) type II error = failure to reject H0, when H0 is actually false Example: Using the example of milk yield of dairy cows with a sample mean of 4300 kg and standard deviation of 600 kg, determine the sample size required to find the sample mean significantly different from 4000 kg, with the power of 0.80 and level of significance of 0.05.