7. The department of code enforcement of a county government issues permits to general contractors to work on residential projects. For each permit issued, the department inspects the result of the project and gives a "pass" or "fail" rating. A faile project must be re-inspected until it receives a pass rating. The department had beer frustrated by the high cost of re-inspection and decided to publish the inspection /records of all contractors on the web. It was hoped that public access to the records would lower the re-inspection rate. A year after the web access was made public, two samples of records were randomly selected. One sample was selected from the pool of records before the web publication and one after. The proportion of projects that passed on the first inspection was noted for each sample. The results are summarized below. Construct a 90% confidence interval for the difference in the passing rate on first inspection between the two time periods. No public web access n1 = Public web access 500 P1 0.67 n2 = 100 p2 = 0.80

7. The department of code enforcement of a county government issues permits to general contractors to work on residential projects. For each permit issued, the department inspects the result of the project and gives a "pass" or "fail" rating. A faile project must be re-inspected until it receives a pass rating. The department had beer frustrated by the high cost of re-inspection and decided to publish the inspection /records of all contractors on the web. It was hoped that public access to the records would lower the re-inspection rate. A year after the web access was made public, two samples of records were randomly selected. One sample was selected from the pool of records before the web publication and one after. The proportion of projects that passed on the first inspection was noted for each sample. The results are summarized below. Construct a 90% confidence interval for the difference in the passing rate on first inspection between the two time periods. No public web access n1 = Public web access 500 P1 0.67 n2 = 100 p2 = 0.80

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter4: Equations Of Linear Functions

Section: Chapter Questions

Problem 8SGR

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7. The department of code enforcement of a county government issues permits to
general contractors to work on residential projects. For each permit issued, the
department inspects the result of the project and gives a "pass" or "fail" rating. A failed
project must be re-inspected until it receives a pass rating. The department had been
frustrated by the high cost of re-inspection and decided to publish the inspection
records of all contractors on the web. It was hoped that public access to the records
would lower the re-inspection rate. A year after the web access was made public, two
samples of records were randomly selected. One sample was selected from the pool
of records before the web publication and one after. The proportion of projects that
passed on the first inspection was noted for each sample. The results are summarized
below. Construct a 90% confidence interval for the difference in the passing rate on
first inspection between the two time periods.
No public web access n1 = 500 p, = 0.67
Public web access
n2 = 100 p2 = 0.80
M O
ASUS
C
&
8.
90
% 4

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