Question

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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  • CreatedJuly 16, 2015
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