Flashcards in Stats 1 Deck (11)
Commenting on the likely reliability of an estimate using least squares regression line
- RELATIVE size of residuals
- How widely the points are scattered
- Therefore reliable/ not reliable
Why might x be a response variable?
X depends on Y
Residuals are found using:
Residual = y – (a+bx)
Mutually exclusive events (cannot happen at the same time):
P(A∩B) = 0
P(A∪B) = P(A) + P(B)
Independent events (do not affect each other):
P(A∩B) = P(A) x P(B)
P(A/B) = P(A)
Exhaustive events (events where all possible outcomes are included):
P(A∪B) = 1
Why might the IQR be an appropriate measure of spread?
It is not affected by unknown/ extreme/ outlying values
Why might the standard deviation be an appropriate measure of spread?
Uses all data values
The value of r is unaffected by...
what is evidence that a set of data is modelled by a normal distribution?
- not skewd