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science chapter 0

scientific method

what is the hypothesis? idea that will be tested by an investigation
what is an example of a hypothesis? why do icebergs float
when can a hypothesis not be tested ? when the technology needed does not exist
what is an example of a hypothesis that cannot be tested? life exists in other solar systems
what do scientists set out to do with their hypothesis? not to prove its true but to show at this point in time it is not false
what is the scientific method ? a series of steps scientists follow to investigate natural occurrences that can be tested
what is a natural occurrence? anything that happens in nature that is not controlled by humans
what is an example of a natural occurrence? an iceberg floating on water
what is an observation? a clear question that must be asked to begin a scientific investigation
what is a theory? a hypothesis that has been tested by scientists many times and has yet to be proven false
what is an example of a theory? the big bang
whats another word for natural occurrences? natural phenomea
what are the first things you need to do before you carry out your investigation? decide what equipment to use and what method to follow and be able to give good reasons as to why you have made these decisions
what is a variable? is any factor that can be changed measured or controlled in an investigation
what are they different types of variables? independent variable(the one that you change) the dependent variable(the one you change as a result of changing the independent variable) controlled(fixed)variables ( all the other variables that are kept the same)
what should a reliable method be? reproducible(if somebody follows your method they should be able to collects data similar to yours) and repeatable (if you repeat the investigation you should collect and record similar data each time
what is primary data? the data collected by the person carrying out the investigation eg roll call at the start of class as your teacher is collecting it
what is secondary data? data is collected by someone other than the person carrying out the investigation
what is quantitative data? the data collected in numbers
what is the other name for quantitative data? numerical?
what is qualitative data? data recorded using descriptive words eg eye colour or gender
what is another name for qualitative data? categorical data
what are some ways of presenting data in a qualitative (nominal or ordinal) way? pie chart, bar chart and line plot
what are some ways of presenting data in a quantitative (discrete) way? bar charts, pie charts and stem and leaf diagrams
what are some ways of presentin g data in a quantitative (continuous) way? scatter plot and histogram
Created by: angel555