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CRA (Canada Revenue Agency) reported that 90% of individual tax returns were filed electronically in 2017.A random sample of 225 tax returns from 2018 was

CRA (Canada Revenue Agency) reported that 90% of individual tax returns were filed electronically in 2017.A random sample of 225 tax returns from 2018 was selected and it was found that 197 were filed electronically.

a.Construct a 95% confidence interval to estimate the actual proportion of taxpayers who filed electronically in 2018.

b. What is the margin of error?

c. What sample size would you recommend if the desired margin of error was set at 0.03?

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