how science works key points


H1- how dose science work

key points

  • observations are often the starting point for an investigation.
  • a hypothesis is a proposal intended to explain certain facts or observations.
  • a prediction is an intelligent guess, based on some knowledge.
  • an experiment is a way of testing your prediction.

H2- fundamental ideas about how science works

key points

  • be on the lookout for non-scientific opinions.
  • continuous data give more information than other types of data.
  • check that evidence is reproducible and valid.

H3- starting an investigation

key points

  • observation is often the starting point for an investigation.
  • testing predictions can lead to new science understanding.
  • you must design investigations that produce valid results if you are to be believed.

H4- planning an investigation

key points

  • care must be taken to ensure fair testing- as far as is possible.
  • control variables must be kept the same during an investigation.
  • surveys are often used when it is impossible to carry out an experiment in which the independent variable is changed.
  • control groups allow you to make a comparison.
  • a risk assessment must be made when planning a practical investigation.

H5- designing an investigation

key points

  • you can use a trial run to make sure that you choose the best values for your variables.
  • the range states the maximum and the minimum values of a variable.
  • the interval is the gap between the values of a variables.
  • careful use of the correct equipment can improve accuracy and precision.
  • you should try to reproduce your


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