math skills Flashcards
percentage error
maximum uncertanty/experimental reading x100
uncertainty
± 1/2 smallest intervals
sa and v equations for sphere
sa - 4πr^2
v- 4/3πr^3
how do you write null hypothesis for kai squared
no difference in frquency
likely to be due to chance
observed results are consistant with the expected distribution
ks degree of freedom
no of classes - 1
how do you do kai squared
find mean for all values
calculate kai squared
find ciritical value
kq accept or reject
if critical value is smaller (closer to one) reject null hypothesis
null hypothesis for t test unpaired
no significant difference in catagorys and the means are equal
T test unpaired degree of freedom
n1 +n2 -2
accept or reject t test
if critical value is smaller (closer to one) reject null hypothesis
null hypotesis for t test paired
no significant difference before and after and the means are equal
degrees of freedom for t test paired
n - 1
spearmens rank accept or reject
if critical value is closer to 0 you reject the null hypothesis
null hypothesis for spearmans rank
no correlation
likely to be due to chance
micro metres to cm
÷ 10000
