BIOL499A Chapter Notes - Chapter 23: Inference, Entomology, Statistical Hypothesis Testing
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Chapter 23: statistical inference confidence interval and. Confidence interval for a population mean when is unknown, How to choose the sample size for a study about a population mean, The necessary steps in the general hypothesis-testing procedure, One-sample hypothesis test for a population mean when is unknown, Theorem: suppose 1 with mean of and standard deviation of , respectively. Y is a random sample from a normal population. S n is called student"s t distribution with. Suppose z has a standard normal distribution. Then, for given (or for simplisity z is defined as: Suppose t has a t -distribution with degrees of freedom of df . Then, is defined as: (or for simplisity t ) (0 dft for given. L and u are called lower and upper bound of the confidence interval, respectively. Twenty-five students are selected at random, find a 95% confidence interval for the average weight of students if we found is called confidence level.