Statistics And Maths Flashcards
What is standard deviation ?
The spread of values around a mean.
At a standard deviation of +/- 2, if the bars overlap what does this mean ?
The results are not significant, they are likely due to change. We accept the null hypothesis.
When would you chose a correlation coefficient?
When looking for an association.
When would you chose chi squared test ?
When comparing frequencies.
When would you use the students t-test ?
When calculating means
If the p value is equal to or lower than 0.05 what does this mean ?
The results are significant, they are not due to chance. We reject the null hypothesis.
If the p value is above 0.05 what does this mean ?
The results are not significant, they are likely due to chance. We accept the null hypothesis.
At a standard deviation of +/- 2 what does no overlap mean ?
The results are significant. They are not due to chance. We reject the null hypothesis.
what is the uncertainty of a reading?
plus or minus half of the smallest scale division.
mass,
what is the uncertainty of a measurement
plus or minus 1 of the smallest scale division.
ruler
how would you workout percentage error
uncertainty / reading x100
