Unformatted text preview: 7.7 Data on the rate of oxygenation, K, in streams have been
obtained for the Cincinnati Pool, Ohio River, at 20°C and sumu
marized as follows. (Data from Kothandaraman, 1968.) Range of Kfper day No. of Observations
00000049 1
0050—0099 11
0100—0149 20
0150—0199 23
0200—0249 15
0250—0299 11
0300—0349 2 (a) If a normal distribution is proposed to model the oxygena
tion rate at the Cincinnati Pool, Ohio River, estimate the mean
and standard deviation of the distribution. ([1) Perform a chisquare test for the goodnessof—ﬁt of the pro—
posed distribution at the 5% signiﬁcance level. 8.6 The error incurred in a given type of measurement by
a surveyor appears to be affected by the surveyor’s years of experience. The following is the data observed for ﬁve
surveyors. Years of Measurement
Surveyor Experience, Y ErrorM in.
l 3 1.5
2 5 0.8
3 10 1.0
4 20 0.8
S 25 0.5 On the basis of the above information, answer the following and
state your assumptions: (:1) For a surveyor with 15 years of esperience, what is the
probability that his measurement error will be less than 1 in.?
(Ans. 0.713) (b) For a 65~yearold surveyor who has 30 years of experience,
can you estimate the probability that his measurement error will
be less than 1 in? Please elaborate. ...
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 Fall '07
 Kargahi

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