87% individual tax returns in 2017. a random sample of 235 tax returns in 2018 were selcted. from the sample 187 were filed electronically.

a. construct a 90% confidence interval for 2018 who filed electroniclsly. lower limit ??? upper limit ??

b. margin error?

A countrys tax collection agency reported that 87% of individual tax returns were filed electronically in 2017. A random sample of 235 tax returns from 2018 was selcted. From this sample, 187 were filed electronically. Complete parts a theough c.

a. Construct a 90% confidence interval to estimate the actual proportion of taxpayers who filed electronically in 2018.

The confidence interval has a lower limit of ____ and a upper limit of ___

b. What is the margin of error?

c. Based on this sample is there any evidence that this propotion has changed since 2017?

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