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It was reported that 63​% of individual tax returns were filed electronically in 2012. A random...

It was reported that 63​% of individual tax returns were filed electronically in 2012. A random sample of 325 tax returns from 2013 was selected. From this​ sample, 237 were filed electronically. Complete parts a through c below.

a. Construct a 95​% confidence interval to estimate the actual proportion of taxpayers who filed electronically in 2013. A 95​% confidence interval to estimate the actual proportion has a lower limit of nothing and an upper limit of nothing. ​(Round to three decimal places as​ needed.)

b. What is the margin of error for this​ sample? The margin of error is nothing. ​(Round to three decimal places as​ needed.)

c. Is there any evidence that this proportion has changed since 2012 based on this​ sample? Because the confidence interval found in part a ▼ does not include includes the reported proportion from​ 2012, this sample ▼ provides does not provide evidence that this proportion has changed since then.

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