Line of best fit
Correlations
Outliers and Predictions
100
True or False:
Your line of best fit must go through at least 1 data point.
False
100
What type of correlation is this? What would be its correlation coefficient? 
Positive; 0.9
100
When most of the points are close to the line of best fit, but one is very far, this is called an _______________.
Outlier
200
True or False:
There should be an equal number of points above and below the line.
True
200
What type of correlation is this? What would be its correlation coefficient? 
Negative ; -0.5
200
True or False:
A line of best fit can go through an outlier.
False
300
What are two points on the line of best fit? 
(0.2,15) (0.4,13) (0.6,14) (0.8,12) (1,13)
300
When the values of one data set increases and the other decreases, this is called a ___________ correlation.
Negative
300
What are the coordinates of the outlier in this graph? 
(8.2,0.9)
400
Which of the following could be the equation of the line of best fit? A) y = 2x + 20 B) y = -2x + 20 C) y = 1/2 x + 20 D) y = -1/2x + 20
B) y=-2x+20
400
When most of the points are very close to the line of best fit, this is called a _______________ correlation.
Strong
400
The equation of the line of best fit is y=-2.12x + 15.5, where x represents the age (in years) of an infant, and y represents the hours of sleep the infant needs. Predict how many hours of sleep an infant who is 6 months (0.5 years) needs.
14.4
500
If there is no correlation, does the line have a positive or negative slope?
Neither! There is no line!
500
When the points on a scatter plot are scattered in the graph and do not follow a trend, this is called ___________ correlation.
no
500
The equation of the line of best fit for a scatter plot is y=12x - 216, where x represents the temperature outside and y represents the sales of the ice cream shop. Predict the temperature outside if the ice cream shop had a total sales of $700.
76.33