the state education commission wants to estimate the fraction of the tenth grade students that have students that have reading skills at or below the eighth grade level.
suppose a sample of
313 tankers is drawn. Of these ships,
251 did not have spills. Using the data, estimate the proportion of
tenth graders reading at or below the eighth grade level.
x
nx
n
phat
251
62
313 0.198083
suppose a sample of
313 tankers is drawn. Of these ships
251
Using the data, construct the
98
confidence level or 1a
0.98
sample porption or p.hat
0.1980830671
a
0.02
a/2
0.01
1a/2
0.99
normsinv(1a/2)
2.326347874
p.hat
(z)* sqrt(p.hat*((1p.hat)/n)
total/answer
low
0.1980830671
0.052407188
0.145676
high
0.1980830671
0.052407188
0.25049
suppose a sample of
1875 floppy disks is drawn. Of these disks
281
Using the data, estimate the proportion of defective.
x
n
phat
281
1875
0.1498666667
suppose a sample of
1875 floppy disks is drawn. Of these disks
281
Using the data, construct the
99
confidence level or 1a
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 Fall '08
 Mendez
 Statistics, Normal Distribution, Confidence Level, oil tankers

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