Calculate the margin of error and construct a confidence interval for the population proportion using the normal approximation to the p̂ p̂ -distribution (if it is appropriate to do so).
Standard Normal Distribution Table a. p̂ =0.9, n=160, α =0.2
E=
Round to four decimal places if necessary
Enter 0 if normal approximation cannot be used
< p <
Round to four decimal places if necessary
Enter 0 if normal approximation cannot be used
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b. p̂ =0.45, n=120, α =0.05
E=
Round to four decimal places if necessary
Enter 0 if normal approximation cannot be used
< p <
Round to four decimal places if necessary
Enter 0 if normal approximation cannot be used