L20-ss - Hypothesis Testing and CI using t-distribution...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Hypothesis Testing and CI using t-distribution 6/8/11 Lecture 20 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Recall ( Section 6.2 ): Tests for population mean Confidence Intervals Connection between the 2 procedures (382-390) Today ( Section 7.1 ): Tests for population mean when the population SD is unknown (418-428) 6/8/11 Lecture 20 2
Background image of page 2
In a discussion of SAT scores, someone comments: “Because only some students take the test, the scores overestimate the ability of typical seniors. The mean SAT-M score is about 475, but I think if all seniors took the test, the mean would be 450.” You gave the test to an SRS of 500 seniors from California. They had an average score of 461. (The SAT-M scores follow a normal distribution with a standard deviation of 100.) Is there sufficient evidence against the claim that the mean for all California seniors is 450 with a significance level of 0.05? Give a 95% CI for the mean score of all seniors. 6/8/11 Lecture 20 3
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
A level 2-sided test Accepts H 0 : = 0 exactly when the value 0 falls inside a level 1 - confidence interval for
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 13

L20-ss - Hypothesis Testing and CI using t-distribution...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online