  Linear Regression Questions

Quiz by Gina Vifquain

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Correct quiz answers unlock more play!  10 questions
• Q1
What is the name of the process used to fine the "line of best fit"?
extrapolation
interpolation
regression
correlation
20s
• Q2
Which is the best prediction for the correlation coefficient? r = -0.8
r = -0.3
r = 0.8
r = -1
20s
• Q3
What term is used when making predictions beyond the values given for x?
correlation
extrapolation
regression
interpolation
20s
• Q4
From the graph, what is the predicted weight of someone who is 50 inches tall? 108 pounds
14 pounds
130 pounds
94 pounds
30s
• Q5
If the linear model is appropriate, what should you see in the residual plot?
a pattern
no pattern
10s
• Q6
Fill in the blank: R-squared is the percent of _______ that is accounted for by the linear model.
data
correlation
standard deviation
variation
20s
• Q7
If an x is 1.5 SD's above average, what would you predict for the value of y?
1.5 SD's below average
1.5r SD's above average
1.5r SD's below average
1.5 SD's above average
20s
• Q8
How do you find a residual?
actual - predicted
predicted - actual
use LinReg in the calculator
20s
• Q9
For the linear equation: price = 0.50(year) + 1.25, what does the slope tell us?
The years went up by 0.50 per price
The initial price is 1.25
The price went up 1.25 per year
The price went up 0.50 per year
20s
• Q10
For the linear model y = -2.5x + 12, if r-squared is 86%, what is the correlation coefficient?
-0.86
-0.93
0.93
9.3
30s

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