QuestionIn a simple random sample of 1600 people age 20 and over in a certain country, the proportion with a certain disease was found to be 0.090 (or $9.0 \%$ ). Complete parts (a) through (d) below. a. What is the standard error of the estimate of the proportion of all people in the country age 20 and over with the disease? $$\mathrm{SE}_{\text {est }}=\square$$ (Round to four decimal places as needed.)