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STAT 2507A &acirc;€“ July 15

# STAT 2507A &acirc;€“ July 15 - 1 STAT 2507A –...

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Unformatted text preview: 1 STAT 2507A – July 15 Jerry Situ 8.6-8.9 Summer 2009 Review What is: Simple random sampling (with and without replacement) Stratified random sampling Cluster sampling Systematic sampling Name an advantage of each sampling method. 2 Review Explain in your own words what the Central Limit Theorem is. Give an example of how it can be applied in a survey. 3 Review You attempt to estimate the average house value in Ottawa by randomly selecting 1000 houses and assessing their value. From the sample, you calculate an 95% confidence interval for the mean of (200K, 250K). How would you interpret this confidence interval? 4 Review of interpretation of confidence interval A confidence interval is an estimate for the population parameter. If the average age is estimated from a sample using a 95% confidence interval of 25 to 30, it DOES NOT mean that there is a 95% chance that the true average is 25 to 30. There is nothing random about the true population age. In above you estimate the true age be somewhere between 25 to 30. You have a 5 Difference between two population means from independent samples You want to test a new way to ask the age of a person. Current way: How old are you? Proposed way: What is your birthday? Objective: To find out how different your estimate of the average population age would be if you asked the question differently. 6 Age example – what is meant by independent sample Situation 1: You randomly select two samples. For sample 1, you ask the current way? For sample 2, you ask the proposed way? Situation 2: You randomly select one sample. You ask both questions. Situation 1 has two independent samples....
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STAT 2507A &acirc;€“ July 15 - 1 STAT 2507A –...

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