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Stat 350 Lab Session GSI: Yizao Wang Section 016 Mon 2pm30-4pm MH 444-D Section 043 Wed 2pm30-4pm MH 444-B 1 Outline • First midterm exam reminder • Big ideas review • Qwizdom and non-qwizdom review questions • In lab project (ILP) on proportion Today’s Qwizdom question is anonymous, you don’t have to login with your UMID. 2 First Midterm Exam • 14th Feb. 6pm-7pm30 1324 EH • Material: Ch. 1, 2, 3, 4, 7, 8, 9.1-9.4, 10.1-10.3, 12.1-12.3, 12.5 HW 1-4 and all lab material • Bring: PICTURE ID, Pen/pencils, erasers, and a calculator. Formula cards with tables will be provided with the exam. • Alternate, randomized seating will be used in the exam rooms. • No cell phones, beepers, palm pilots allowed in the exam rooms. • All bags/backpacks will be placed against the exam room wall, so the less extra things you bring, the better. 3 Data • We’ve talked about two broad types of data this semester • Do you remember what they are? 4 Probability • We learned several rules for calculating probabilities of events – E.g. the event ‘Tails’ in the flip of a fair coin • Special relationships between two events – Mutually exclusive – Independent – Could you provide definitions and examples of each? 5 Random Variables • We’ve talked about two types of random variables – Can you name them? • We’ve talked about three different models (i.e. distributions) for random variables – Can you describe them (be specific)? – Can you find probabilities under each? – Do you know which model is appropriate for each type? 6 Sampling Distribution of p-hat • Can you describe what the sampling distribution of p-hat is? • Do you know when to use it? – When the problem asks you to find a probability for a sample proportion – When the sample size is large enough: np≥10, n(1-p) ≥10 7 Confidence Intervals for p • Useful when we want to provide a range of reasonable estimates for the population proportion • Do you know how to interpret the confidence level? • Do you know how to use a confidence interval to make a decision, and under what conditions this would be appropriate? 8 Hypothesis Testing for p • Useful for making a Yes/No type decision about particular value(s) of a population proportion • Do you know the 5 steps of hypothesis testing? • Can you interpret and calculate a test statistic? • Can you interpret and calculate a p-value? 9