STAT_13_HW7a_Sol

# STAT_13_HW7a_Sol - STA 13C Professor Francisco J Samaniego...

This preview shows pages 1–4. Sign up to view the full content.

1 STA 13C Homework 7 (I) Professor Francisco J. Samaniego Solutions for Homework 7 (Part I) Problems 9.6, 9.7, 9.11, 9.13, four additional problems Problem 9.6

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

View Full Document
2 Problem 9.7 a) According to part (d) in Problem 9.6, z = 2.04. The p-value is therefore 0.0207. b) Since p-value = 0.0207 < α = 0.05, we reject the null hypothesis at the 0.05 level. That is there is sufficient evidence to indicate that μ > 2.3. c) The conclusions in part (b) and the one in Problem 9.6 part (d) are the same. Problem 9.11
3 Problem 9.13 Note that this problem is asking for a two-tailed test. Part (a), (b), and (c) n = 100 , x ffff = 79.7 , s = 0.8 , α = 0.05 H 0 : μ= 80 H A : μ≠ 80 z = x @ μ sn p wwwwww * fffffffffffffffffff = 79.7 @ 80 0.8 100 p wwwwwwwwwwwww * fffffffffffffffffffffffffffffff = @ 3.75 p @ value = 2 B PZ < @ 3.75 `a = 28 . 8 4 1 7 B 10 @ 5 bc 0 Since p-value 0 < α = 0.05, we reject the null hypothesis at the 0.05 level. That is there is sufficient evidence to refute the manufacturer’s claim. Additional Problems Problem #1 a) α= P reject H 0 | H 0 is true Since the rejection region is X 1 , # PX 1| p = 2 3 fff fg Since X ~ Bin 4 , 2 3 under the null hypothesis, # = 0 + = 1 = 4 0 de

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.

## This note was uploaded on 02/21/2009 for the course STATS 13 taught by Professor Leong during the Fall '07 term at UC Davis.

### Page1 / 5

STAT_13_HW7a_Sol - STA 13C Professor Francisco J Samaniego...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online