Question: The IRS reported that 81 of individual tax returns were

The IRS reported that 81% of individual tax returns were filed electronically in 2012. A random sample of 225 tax returns from 2013 was selected. From this sample, 176 were filed electronically.
a. Construct a 95% confidence interval to estimate the actual proportion of taxpayers who filed electronically in 2013.
b. What is the margin of error for this sample?
c. Is there any evidence that this proportion has changed since 2012 based on this sample?
d. Verify your results with PHStat.

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