{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

lecture10

lecture10 - Psych 100A Winter 2010 Lecture Lecture 10...

This preview shows pages 1–6. Sign up to view the full content.

Psych 100A Winter 2010 ecture 0: ypothesis testing & Lecture 10: Hypothesis testing & Power Analysis 1. Test for , known 2. Computation of power 3. Relationships among , power and n ower curves 4. Power curves

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

View Full Document
HT: notations and definitions (continued) 12.Tests of significance are about one question and that question is always the same: “How easy is it to explain the difference between the observed data (sample statistic) and the expected outcome (H O ) by chance alone.” 2
3. Theorem: hypothesis test for , 2 known If x 1 , x 2 , …, x n is a random sample from a normal population or a large random sample from ny population with nown variance then do any population with known variance 2 , then do O H  : A  . 1 : versus . 3 . 2 n x z TS : . 2 . 1 : if reject CR error I type 2 . 3 3

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

View Full Document
Example (Kuzma). Boys of a certain age have a mean weight of 85 lb. A complaint was made that, in a municipal children’s home, the boys are underfed. As one bit of evidence, all 25 boys of a given age were weighed and lb. 94 . 80 x Suppose it is known that = 11.6 lb . At a significance level = 0.05 , what do you conclude about the complaint? 4
Solution. 1. H O : = 85 lb versus H A : < 85 lb. 2. Data: lb. 94 . 80 x 3. Assumptions: RS of 25 boys a. SRS of 25 boys b. Weights normally distributed c. = 11.6 lb.

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 25

lecture10 - Psych 100A Winter 2010 Lecture Lecture 10...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online