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what are the 3 stages of when i scientist comes up with a hypothesis ?
the scientist tests it
then multiple scientists will test it
if all the evidence supports it the hypothesis is accepted for now
what is the independant variable
the variable that changes
What is the dependant variable
the variable that is measured
what is the control variable
the variable that stays the same
What makes evidence valid ?
it has to be repeatable
it has to be repoducable
What is accurate data ?
data that is close to the true answer
What is precise data ?
when the data collected are all very close to each other and the mean
What is a random error ?
unpredicatbale differences in things such as human error and measuring.
What is a systematic error?
when a measurement is wrong by the same amount every time
repeating the experiment the exact same way will not correct it
What is a zero error ?
when equipment is not set to zero and has a reading before use
How can you solve a zero error ?
by noting the initial measurement and subtracting it from all your results at the end
What do you do with anomolous results
yu can ignore it when processing the results (e.g., a mean)
Define:
mean
median
mode
mean - add all numbers together and divide by how many results
median - righting the numbers in numerical order and finding the middle number
mode - find the value that occurs the most freuqent
how do you present categorical data ?
in a bar chart
how do present continuous data
in a line graph
What axis does the dependant variable go on ?
What axis does the independant variable go on ?
dependant - y axis
independant - x axis
How do you find out the gradient ?
change in y/ change in x
How do you find the gradient of a point on a curve ?
draw a tangent from that point on the curve and find out the gradient of the tangent
What does this graph show ?
Positive corrolation
What does this graph show ?
Negative corrolation
What does this graph show ?
No corrolation
What is the multiple unit for tera ?
1 x 10^12
What is the multiple unit for giga ?
1 x 10^9
What is the multiple unit for mega ?
1 x 10^6
What is the multiple unit for kilo ?
1 x 10^3
What is the multiple unit for deci ?
1 x 10^-1
What is the multiple unit for centi ?
1 x 10^-2
What is the multiple unit for milli ?
1 x 10^-3
What is the multiple unit for micro ? (μ)
1 x 10^-6
What is the multiple unit for nano ? (n)
1 x 10^-9
What do you do if you are going from a smaller to bigger unit ?
divide
What do you do if you are going from a bigger to smaller unit ?
multiply
how dyou figure out the uncertainty ?
range/2
What should yo include in a scientific evaluation ?
is the method valid and a fair test
quality of the results (repeatable, repoducable, accurate,precise)
were there any anomolous results and which error caused them
comment on the uncertainty
suggest any changes to the method to omprove the quality of the results
Note 
Flashcard (93)