Math - Confidence Intervals Notes
The z values for the given confidence intervals will either have to be learnt or can be
worked out using the % point table on pg 25
The formula is:
(zx , +zx )
where is the sample mean and will be given or can be found,
n
Math - Least squares regression lines
Calculation
This should always go through the point ( ,
=
=
The equation of a least square regression line is given by y = a + bx
b=
=
= x -
these are on pg 13 of the formula book
a= -b
your calculator can work these
Solve each problem by using multiplication or division and use visual models to support
your answer. Your model should match product or quotient you arrive at.
Think about what action is taking place in each situation and use your notes on
multiplying and