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Oak National Academy
12 questions
A PE teacher wants to split the students at her school based on the strata of the sport the student enjoys the most. Select the appropriate strata.
A ___ may be split into groups or strata. A stratified sample is where a representative sample is taken from each stratum.
Select the sample that is most representative of the population from the given strata: A hospital with 1800 patients and 200 staff.A sample of 200 people is taken.
A company employs 250 band A workers, 350 band B workers and 200 Band C workers. A manager wants to take a stratified sample of 160 workers. How many workers from each band should be sampled?
A bus company wants to take a sample of 1000 customers, stratified by age. The table shows the number of customers in each age group. The bus company should choose ___ under-16s for the sample.
A bus company wants to take a sample of 500 customers, stratified by age. The table shows the number of customers in each age group. The bus company should choose ___ 16-65 year olds for the sample.
__________ is a sampling method which allows you to estimate the size of a population without counting it fully.
Izzy captures 10 hedgehogs and marks each one with a paper band around its leg. Izzy then recaptures 10 hedgehogs, but finds that none of them have a paper band. Select the possible reasons for this.
To estimate the population of birds in a wood, 5 birds are captured from a single tree and marked. 9 months later, in a recapture of 10 birds, 0 were marked. Which factors may effect the results?
As part of a capture-recapture sample, 100 fish from a lake are captured and marked with a white dye. During a recapture of 50 fish, 5 were marked with the white dye. Select the correct statement.
Andeep captures 15 deer and marks them by attaching a tag to their legs. Three days later, Andeep recaptures 30 deer, and 3 of them have a tag attached. Estimate the total number of deer.
Jun captures 45 squirrels and marks them by attaching a tag to their legs. Three days later, Jun recaptures 70 squirrels, and 15 of them have a tag attached. Estimate the total number of squirrels.
