During routine screening a doctor notices that 18% of her adult patients show higher than normal levels of glucose in their blood ---- a possible warning signal for diabetes. Hearing this, some medical researchers decide to conduct a large-scale study, hoping to estimate the proportion to within 5% with 95% confidence. How many randomly selected adults must they test?
The number of adults that should be tested is ____.
Sample size = Z2/2 * p (1 - p) / E2
= 1.962 * 0.18 * 0.82 / 0.052
= 226.81
Sample size = 227 (Rounded up to nearest integer)
During routine screening a doctor notices that 18% of her adult patients show higher than normal...
During routine conversations, the CEO of a new start-up reports that 15% of adults between the ages of 21 and 39 will purchase her new product. Hearing this, some investors decide to conduct a large-scale study, hoping to estimate the proportion to within 5% with 90% confidence. How many randomly selected adults between the ages of 21 and 39 must they survey? The number of adults that should be surveyed is ------. (Round up to the nearest whole number.)