# Linear Regression Questions

## Quiz by Gina Vifquain

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10 questions

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- Q1What is the name of the process used to fine the "line of best fit"?extrapolationinterpolationregressioncorrelation20s
- Q2Which is the best prediction for the correlation coefficient?r = -0.8r = -0.3r = 0.8r = -120s
- Q3What term is used when making predictions beyond the values given for x?correlationextrapolationregressioninterpolation20s
- Q4From the graph, what is the predicted weight of someone who is 50 inches tall?108 pounds14 pounds130 pounds94 pounds30s
- Q5If the linear model is appropriate, what should you see in the residual plot?a patternno pattern10s
- Q6Fill in the blank: R-squared is the percent of _______ that is accounted for by the linear model.datacorrelationstandard deviationvariation20s
- Q7If an x is 1.5 SD's above average, what would you predict for the value of y?1.5 SD's below average1.5r SD's above average1.5r SD's below average1.5 SD's above average20s
- Q8How do you find a residual?actual - predictedpredicted - actualuse LinReg in the calculator20s
- Q9For the linear equation: price = 0.50(year) + 1.25, what does the slope tell us?The years went up by 0.50 per priceThe initial price is 1.25The price went up 1.25 per yearThe price went up 0.50 per year20s
- Q10For the linear model y = -2.5x + 12, if r-squared is 86%, what is the correlation coefficient?-0.86-0.930.939.330s