Since the financial scandals of the early 2000s, companies have been working to improve their internal audit

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Since the financial scandals of the early 2000s, companies have been working to improve their internal audit procedures. In a study conducted by the Global Auditing Information Network (GAIN), 42 of the 165 randomly selected American companies surveyed said they would substantially increase the size of their internal audit staff within the next year.
a. Build a 90% confidence interval estimate of the proportion of all American companies who will substantially increase the size of their audit staff during the next year.
b. Interpret the interval you produced in part a.
c. Identify the standard error and the margin of error in your interval.
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Related Book For  book-img-for-question

Understanding Business Statistics

ISBN: 978-1118145258

1st edition

Authors: Stacey Jones, Tim Bergquist, Ned Freed

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