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Lab 1
Question 1
Turn to page 522 of your text and read the story for question 6. (A space is provided for you
to copy the question if you wish.)
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a.
Answer part (a) from the text book. [i.e., explain what probability is being measured]
If the true percentage of children who did not attain the grade level standard
really is 15.9%, there is 0.023 probability that in a (random) sample of 8500
students we would see a percentage as low as 15.1%.
b.
(i)
ADDITION TO PART b
:
Calculate a 95% confidence interval.
p
ˆ
± z* SE(
) =
± z*
p
ˆ
p
ˆ
n
q
p
ˆ
ˆ
0.151 ± 1.960
8500
)
849
.
0
)(
151
.
0
(
= 0.151 ± 1.96*0.004 =
(0.147, 0.155)
or 14.7 to 15.5%
(ii)
Answer part (b) from this question in the text book
ANSWER:
Although a pvalue of 2.3% is small, giving good evidence that the new reading
program is better, we are confident that there’s only been a decrease of at most
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This note was uploaded on 01/31/2011 for the course MATH 2209 taught by Professor Mm during the Winter '10 term at MSVU Duplicate.
 Winter '10
 MM
 Probability

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