eme":"- There is no sampling frame (it is impossible to number/identify every fish in the lake). B1","marks":1,"order":0,"markingRubric":{"totalMarks":1,"points":[{"id":"p1","marks":1,"description":"Identifies that there is no sampling frame or list of all fish.","code":"B"}],"finalAnswers":[],"generatedAt":"2026-05-12T02:14:06.549Z","modelVersion":"gemini-3-flash-preview"}},{"id":"2c323805-8279-4a55-8b71-df54e2d8ee8c","label":"b","content":"Explain how a sample of size 120 could be taken to ensure that the estimated populations of each type of fish are fairly represented.\n\nYou should state the name of the sampling method used.","markscheme":"- Name the method: Quota sampling. B1\n- Description: Keep catching fish until the quota for each group has been met. B1\n\n*Note: Quotas are calculated as:*\n- Roach: $\\frac{350}{1400} \\times 120 = 30$\n- Bream: 21\n- Rudd: 17\n- Tench: 13\n- Carp: 39","marks":2,"order":1,"markingRubric":{"totalMarks":2,"points":[{"id":"p1","marks":1,"description":"Correctly identifies Quota sampling.","code":"B"},{"id":"p2","marks":1,"description":"Explains that fish are caught until the specific quota for each type is reached.","code":"B"}],"finalAnswers":[],"generatedAt":"2026-05-12T02:14:06.549Z","modelVersion":"gemini-3-flash-preview"}}],"options":[]},{"id":"ad393bfe-1dac-4b3c-9648-a9237c632812","revisionId":"c85a5479-e66e-4754-95d1-dd11e1cb3113","questionNumber":"3","questionType":"LA","specification":"Kwame is studying the time it takes members of his gym to travel to the gym. \nHe stands by the door of the gym in the morning and asks the first 40 members as they arrive how long their journey was.","difficulty":1,"totalMarks":3,"sourceTitle":"Question Set 1: Data Collection","calculatorUse":null,"parts":[{"id":"3933de76-9c43-4f29-9bbc-4af4d83f994c","label":"a","content":"State the sampling method Kwame used.","markscheme":"- Opportunity sampling (or Convenience sampling). B1","marks":1,"order":0,"markingRubric":{"totalMarks":1,"points":[{"id":"p1","marks":1,"description":"Identifies the method as opportunity or convenience sampling.","code":"B"}],"finalAnswers":["Opportunity sampling"],"generatedAt":"2026-05-12T02:14:06.549Z","modelVersion":"gemini-3-flash-preview"}},{"id":"277bf8a6-9999-4a57-a886-97a42d33ad34","label":"b","content":"State and briefly describe an alternative method of non-random sampling Kwame could have used to obtain a sample of 40 members.","markscheme":"- Quota sampling. B1\n- Split the population into groups (e.g., age or gender). Each group's size determines the size of the group in the sample. Then ask people until each group's quota is filled. B1","marks":2,"order":1,"markingRubric":{"totalMarks":2,"points":[{"id":"p1","marks":1,"description":"Identifies Quota sampling as an alternative non-random method.","code":"B"},{"id":"p2","marks":1,"description":"Describes dividing the population into strata/groups and filling quotas for each.","code":"B"}],"finalAnswers":[],"generatedAt":"2026-05-12T02:14:06.549Z","modelVersion":"gemini-3-flash-preview"}}],"options":[]},{"id":"864bbee3-3cb5-474e-8be8-1028d00aaf4b","revisionId":"3f0131ef-25d1-465b-8039-e6c0b0af90dd","questionNumber":"4","questionType":"LA","specification":"Osman has 150 employees. He wants to find out what the employees think about the staff canteen.","difficulty":1,"totalMarks":3,"sourceTitle":"Question Set 1: Data Collection","calculatorUse":null,"parts":[{"id":"069094b4-945c-4b75-9c3c-13ab4570465f","label":"","content":"Explain how Osman can select a sample of 30 employees using systematic sampling.","markscheme":"- Calculate the interval: $k = \\frac{150}{30} = 5$. M1\n- Get a list of all employees and number them 1-150. B1\n- Pick a random number from 1 to 5 as the starting point. Then select every 5th person on the list (e.g., if 2 is picked, select 2, 7, 12, ...) until 30 employees are chosen. B1","marks":3,"order":0,"markingRubric":{"totalMarks":3,"points":[{"id":"