# Sample quiz on line of best fit Main home here.

1. A straight line that best describes the distribution of points in a scatter plot is usually referred to as $\cdots$?
correlation line
line of best fit
interpolation line
extrapolation line
2. A line of best fit can be used for the following except $\cdots$
look at the strength of a correlation
estimate other data points
find an equation that best fits the data
determine if there is bias in the data
3. The average value of all the independent variables and the average value of all the dependent variables, when written as an ordered pair $(a,b)$ is known as $\cdots$?
mean coordinate
best coordinate
modal coordinate
crucial coordinate
4. Which of the following can be considered a mathematical model?
graphs
equations
diagrams
all of the above
5. Find the mean coordinate for the points: $(0,0),(2,1),(3,3),(-2,3),(5,2)$.
$(4.5,4)$
$(1.6,1.8)$
$(4,4.5)$
$(1.8,1.6)$
6. Find the mean coordinate for the points: $(-1,-1),(0,0),(2,1),(3,3),(-2,3),(4,6)$
$(1,2)$
$(2,1)$
$(3,6)$
$(6,3)$
7. The general direction that a set of data takes is known as $\cdots$
a correlation
a survey
a trend
a sample
8. When the depedent variable increases as the independent variable increases, the correlation type is $\cdots$
one
zero
negative
positive
9. When the dependent variable decreases as the independent variable increases, the correlation type is $\cdots$
negative
positive
zero
one
10. When there is no discernible pattern in a data set, the corresponding correlation is $\cdots$?
one
zero
negative
positive