Biostats Lesson 7
Authored by Zeb Miller
Mathematics
University
Used 3+ times
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10 questions
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1.
DROPDOWN QUESTION
1 min • 1 pt
The (a) is the Dependent variable or the variable being observed.
The (b) is the Independent variable or the variable being manipulated.
2.
DROPDOWN QUESTION
1 min • 1 pt
The residual (ei) is the (a) value (yi) minus the (b) value (ŷi).
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Outlier: An observation that is extremely different from other observations.
Influential point: A point in the data that would have a significant impact on the life of best fit if removed.
Given the above definitions, is this statement true or false: all outliers are influential points.
True
False
Answer explanation
You can have an outlier without it being an influential point. The first outlier in the image is an influential point while the second outlier in the image is not.
4.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Select ALL TRUE statements about the coefficient of determination (r2).
Number between 0 and 1.
The closer it is to 0, the better our least-squares regression line explains the response.
Proportion of variation in y.
Correlation between y and x.
The closer it is to 1, the better our least-squares regression line explains the response.
5.
MATCH QUESTION
1 min • 1 pt
Match the following variables with what they represent.
Intercept
ȳ / x̄
Standard Deviation
Sx / Sy
Correlation
r
Mean
b
Slope
a
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Select the r2 value that would belong to the best fitting least-squares regression line.
0.03
0.48
0.96
Answer explanation
The closer r2 is to 1, the better the line fits. 0.96 is the closest value to 1.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which example from the image is most impacted by the outlier represented in red?
Example 1
Example 2
Example 3
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