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# xyFeb24Lec16 - Example 7 Suppose a sample of n students...

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Example 7 Suppose a sample of n students were given a diagnostic test before and after completing a module. Here we have n 1 = n 2 = 10 students, the data is as follows: Find a 95% confidence interval for the differences. 2/25/12 1 Lecture 15- Xuanyao He

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Calculate the 90% C.I. for the difference between post and pre scores. Answer: [-.11,3.31] 2/25/12 Lecture 15- Xuanyao He 2
Testing Statistical Hypotheses Chapter 8 2/25/12 3 Lecture 15- Xuanyao He

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Hypotheses Testing Confidence Intervals estimate an unknown population parameter. give a range of values where we think the true parameter lies. Hypothesis Tests assess the evidence provided by the data in favor of or against some claim (called a hypothesis) about the population parameter(s) 2/25/12 4 Lecture 15- Xuanyao He
8.1 Hypotheses and Test Procedures A statistical hypothesis is a claim or assertion about a population parameter(s) To get some idea about the population, we measure statistics from random samples Observe: What does the sample suggest about the parameter? What does the claim say about the parameter? Do they agree, disagree? 2/25/12 5 Lecture 15- Xuanyao He

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Stating Hypotheses 1. Are Tim Kelly s weight measurements compatible with the claim that his true mean weight is 187 pounds? 2. In a random sample of 100 light bulbs, 7 are found defective. Is this compatible with the manufacturer s claim of only 5% of the light bulbs produced are defective? 2/25/12 6 Lecture 15- Xuanyao He
Stating Hypotheses The hypothesis is a statement about the parameters in a population or model not about the data at hand.

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## This note was uploaded on 03/26/2012 for the course STAT 350 taught by Professor Staff during the Spring '08 term at Purdue.

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xyFeb24Lec16 - Example 7 Suppose a sample of n students...

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