J S.

asked • 08/26/20

grade 12 data management question

Darth Vader kept track of the number of advertisements he placed in local newspapers each day and the number of new recruits to the Galactic Empire each day:

You MAY wish to complete this table to help you answer questions (b) and (c) below.

# of ADS # NEW RECRUITS


6 20


5 15


3 12


2 8


1 6


4 7


3 9







a = n(∑xy) − (∑x)(∑y)

a) Determine the line of best fit y = ax + b , using the formulas n(∑x2 ) − (∑x)2 and

b = y − ax

Show all your work. Round answers to 2 decimal places.


b) Calculate the correlation coefficient for the set of data using the formula, and classify the correlation.

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