Biology 2244A/B Chapter Notes - Chapter 15: Sampling Distribution, Statistical Inference, Confidence Interval
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Z procedures: procedures for statistical inference that start with the one- sample z statistic and use the standard normal distribution. Need srs and normal population to draw conclusions by statistical inference. Inference is most reliable when data comes from. Random comparative experiment: use chance to assign subjects to treatments. 15. 1. 2: what is the shape of the population distribution. Many basic inference methods are designed for normal populations. Many procedures are based on normality of sample mean. Any inference based on sample statistics like sample mean that are not. Central limit theorem: sample mean is more normal than the individual observations. Sample mean: becomes more normal as sample size increases. Any inference based on sample statistics like sample mean that are not resistant to outliers can be strongly influenced by them. When data is chosen at random from a population. Distribution of sample: similar shape to population distribution. High confidence: says that our method almost always gives correct answers.