Choose a topic, a skill or a difficulty. Calculation exercises have new versions with fresh numbers once you have solved them, so you can practise the method rather than memorise an answer.
A random sample of 500 registered patients at a health network found that 345 would use video consultations. Compute the approximate 95% margin of error for the proportion, 1.96p^(1−p^)/n, in percentage points (1 decimal place).