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hello and welcome to this dot cross maths key skill video on taking a stratified sample letamp;#39;s read the question first and then iamp;#39;ll explain what stratified sampling is the table shows the number of people in each year group weamp;#39;ve got different year groups year seven year eight year nine year ten year 11 and weamp;#39;re told the number of pupils in each year group to carry out a survey jessica uses a stratified sample of 50 pupils ing to year group calculate the number of year 11 students that should be in her sample now with something called a simple random sample we just choose the students from the whole school completely randomly we might for example put all the names of all the students in the school in a hat and just pick out 50 random students the problem is that just by some bad luck it might be biased towards a year group so it might happen that we pick too many year nine students out of our hat and that means the data is going to be skewed towards yea