Stat 3011
Homework 10
Stat 3011: Homework 10
Due:
Tuesday, April 21st
Directions:
•
Where indicated, answer the questions on this sheet, not the questions in the book.
•
Problems for which Rweb is required are marked accordingly. If the directions do not
specif
ically
instruct you to use Rweb, then you should do the problem by hand.
Assigned Exercises:
1. 10.4 (page 480)
(a) book part a
(b)
Verify
that a 99% conﬁdence interval for the true diﬀerence is (.034,0.050).
(Use ˆ
p
1
= sample proportion that smoked in 1991 and ˆ
p
2
= sample proportion that
smoked in 2003.)
(c)
Interpret
the interval from part b, indicating the relevance of 0 not falling in the interval.
2. 10.10 part a (page 481)
 You do not have to do part b, but you should think about it.
 Hint: Part a is asking you to test the manager’s claim that
p
A
(the proportion of Group A
that will buy the product) is
signiﬁcantly
greater than
p
B
(the proportion of Group B that
will buy the product).
3. 10.23 (page 492)
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 Spring '09
 WANG,ZHAN
 Statistics, sample proportion, Rweb, sample diﬀerences

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