The newest 20 of 45 written questions. Open one to see it on the real paper.
A farmer investigates how effective insecticides are for killing mosquito larvae. Three rice fields are sprayed with water and three different rice fields are sprayed with insecticide. The water is used as a control to compare with the results of the insecticide. The six fields are selected at random. Describe how to s...
See it on the paper →Identify the mean number of larvae counted on day 10 in the fields sprayed with insecticide.
See it on the paper →Ascientist estimates the pangolin population in a forest. Arandom sampling method is used. Explain how a map of the forest is used to select random sampling sites.
See it on the paper →The scientist counts pangolins and calculates the pangolin population per km2. This number is then scaled up to the total area of the forest to obtain an estimate of the total pangolin population. Suggest one way to improve the method used to obtain this estimate.
See it on the paper →Describe how the scientist can systematically select squares to investigate the population of pied avocets.
See it on the paper →A student investigates the number of different species of flowering plants in the north of Greenland. Statements A–F describe the method the student uses. The statements are not in the correct order. A mark 10 sampling sites at regular intervals along the transect line B make a 10 m transect line with a measuring tape...
See it on the paper →Name the sampling method used by the student.
See it on the paper →The student records a total of 4 flowering plants of one species in the 10 quadrats. Each quadrat is 1 m 2 . Estimate the number of flowering plants of this species in 1 km 2 (1 000 000 m 2 ).
See it on the paper →The student decides to repeat the survey on a different day. Suggest two other ways the student could improve this survey.
See it on the paper →Describe a method to estimate the total population of pilot whales around the Faroe Islands. • • • how to select an area to sample how the population will be counted in the sample area how the total population will be estimated. Include in your method:
See it on the paper →Name this method of sampling.
See it on the paper →Determine the total number of trees the farmer samples in the field using this method.
See it on the paper →Explain why fertiliser was not used on tree row 1. (i)
See it on the paper →Describe a method to estimate the total population of pilot whales around the Faroe Islands. • • • how to select an area to sample how the population will be counted in the sample area how the total population will be estimated. Include in your method:
See it on the paper →Describe how the scientist: • • • • uses systematic sampling collects the data using a transect records the data collected obtains an estimate for the population of orchids in the forest.
See it on the paper →Suggest two reasons why the student decides not to use method one.
See it on the paper →Suggest two ways method three is better than method two.
See it on the paper →The scientist considers two plans for collecting samples of water and fish from the reservoir. Plan 1 • Visit each site, A–D, on one day in January. • Collect samples of water and fish. Plan 2 • Visit each site, A–D, on one day in January, one day in March and one day in May. • Collect samples of water and fish on each...
See it on the paper →Calculate the range of average concentration of mercury in water. arbitrary units
See it on the paper →Suggest one reason why the scientist decides to repeat the survey for May at site C.
See it on the paper →Most candidates knew some key terms about sampling from a full population and stated terms such as grid, quadrat or systematic/random sampling. Few candidates were able to apply these ideas to a large area of sea and some inappropriately suggested laying 1 m x 1 m quadrats onto the sea and counting these large aquatic mammals which do not spend their lives at the surface. There were a few good ide...
— Examiner report, May/June 2025, 0680/21 Q2(a)(v) (Cambridge)
‘Systematic sampling’ was not well known. Many incorrect spellings were seen such as ‘systemic’.
— Examiner report, May/June 2025, 0680/22 Q2(c)(i) (Cambridge)
Most candidates determined the total number of trees correctly. A common incorrect approach was to state ‘3’ – the number of circled sampled trees shown in the diagram.
— Examiner report, May/June 2025, 0680/22 Q2(c)(ii) (Cambridge)
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