statistics Flashcards
how many main types of statistics are there and what are they
- Measuring the spread (standard deviation), and statistical tests.
what does descriptive statistics involve
range and standard deviation from mean
when would you use a statistical test
to allow what we do know to make judgements about what we don’t know
how many types of statistical tests are there and what are they called
- Chi squared, student’s t-test, spearman’s rank
in a test will you be asked to perform a calculation
no but you will need to know how the answer was recieved
what is the formula for range
range= largest value - smallest value
sometimes we can’t use the range why
because there are outliers therefore its not a good measure of the spread.
what is the range used for
a type of measurement to calculate the spread
what does standard deviation mean
measure of how spread out all your repeats are from your mean
why is using standard deviation better than using the range
because SD looks at the spread of data around mean and its less affected by outliers
what does a high and low standard deviation look like
low- thin curve
high- fat curve
what does a thin curve mean
that most values remain close to the average and the standard deviation is small
what does a fat curve mean
that there is a wider spread of data around the mean, standard deviation is large
what will a normal standard deviation graph look like
a bell- shaped graph
what is the percentage of data that is within 1 standard deviation either side of the mean
over 68%
