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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 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
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 28PPS
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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
Transcribed Image Text: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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