Q194 · Practice questionTechnology-freeComplex familiar3 marks
QUESTION 194 (3 marks)
For random samples from a population with proportion , the standard deviation of is . Determine the sample size .
WORKED SOLUTION
3 marksPractice marking scheme
ANSWER
.
Worked solution
. Squaring gives , hence .
Uses the standard-deviation formula for .
Forms the equation in .
Solves for .
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
View the QCAA syllabusHow many marks did you earn?
Compare your working with the guide above.