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STAT 250 Review Material

# STAT 250 Review Material - Test 2 You will need Table A...

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Test 2 You will need Table A, formula sheet (1 page front and back), calculator, pencil, and scantron. Chapters 3 and 11: Finding probabilities you will need Table A and the formula x z for the distribution X~N(  ) or the formula x z n for the sampling distribution of the sample mean ~ ( , ) X X X N ), Finding the variable value for a particular probability under the Normal Curve you will need table A and the formula x = +z . Chapter 13: Use the CDF to find Binomial probabilities. Find the mean and standard deviation for the binomial, X~Binomial(n,p) The mean is calculated * n p and the standard deviation * *(1 ) n p p Chapter 14-16 Calculating confidence intervals and doing Tests of Significance (Hypothesis Tests) For confidence intervals, remember the 3 conditions must be met: 1. Sample obtained by a Simple Random Sample 2. Normality established a. The variable distribution is normal which will make the sampling distribution normal no

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