Estimate the size of a [[population]] of a [[species]] within a [[habitat]] using [[Sampling (Biology)|sampling]] techniques and investigate a factor affecting [[population]] size.
===Method===
*Estimate the population of a species within a habitat using random sampling.#Place a quadrat in a random location in a field. (''Exam boards apparently do not allow throwing of the quadrat, even though this would reduce bias in the choice of sample space.'')#Count the number of daisies within the quadrat.#Repeat steps 1 and 2 ten times.#Calculate the mean number of daisies.#Use the following equation to estimate the number of daisies in the field:: Estimated population = <math>\tfrac{area sampled}{total area}</math> x number of daisies Investigate the effect of a factor on plant distribution using a transect.#Stretch a 30m tape from the base of a tree out into an open area of field. This will be the transect.#Place a quadrat at 0m on the transect and count the number of daisies within the quadrat.#Repeat step 2 six times moving the quadrat 5m further along the transect each time.#At each location you may measure the light intensity, soil hydration or soil [[Independent VariablepH]] - to determine if this factor affects the abundance of daisies.===References=======Edexcel====*:[[Dependent Variable]] https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Biology core practicals; quadrats and transects, pages 128- *[[Control Variable]129, GCSE Combined Science, Pearson Edexcel '']s - #