1
Q
why is spearmans rank better than PMCC
A
B1 for PMCC measures (the strength of) linear correlation / linear
association
B1 for Spearman’s rank correlation is used for ranked data/ordinal data
2
Q
interpret skew in context
A
3
Q
sample mean vs population mean &
sample spread vs population spread
A
sample mean roughly equals population mean
the spread of the sample mean is smaller than individual values of the population
4
Q
skew and box plots
A
5
Q
why is using a weighted index number appropriate for RPI/CPI etc
A
takes into account the fact that consumers spend more on some goods than others
