Prediction (Optional) Quiz

When making a scatter plot for the driver deaths data, which is used as the independent variable?

• Number of driver deaths
• Age
• Area in square miles
• Year of birth

For the 75+ age group, what x value should be used?

• 85
• 75
• 70
• 80

In what form should the least-squares line be written?

• x = a + by
• y = mx + c
• ŷ = a + bx
• ŷ = bx − a

In the driver deaths task, for which two ages are you asked to predict deaths?

• 40 and 60 years
• 30 and 80 years
• 50 and 70 years
• 20 and 40 years

After finding the slope of the best-fit line, what else are you asked to do?

• Interpret the slope
• Square the slope
• Reverse the slope
• Ignore it

For the life expectancy data, the independent variable is:

• Life expectancy
• Rank
• Area
• Year of birth

For the life expectancy task, estimates are requested for individuals born in:

• 1950 and 1982
• 1850 and 1950
• 1900 and 1940
• 1932 and 1984

Why do the Part E life expectancy answers differ from the table values?

• They are outliers
• They come from a fitted line
• Table values are wrong
• Different units used

Which of the two Part E points is used to plot the least-squares line?

• The two points in Part E
• The midpoints
• Only outliers
• Table values

For a birth year of 1850, the question asks whether the least-squares line gives:

• A negative slope
• A scatter plot
• An accurate estimate
• A correlation coefficient

In the restaurant page-number data, which is the dependent variable?

• Page number
• Age
• Maximum value
• Year

For the restaurant data, estimated maximum values are found for restaurants on which pages?

• Pages 1 and 200
• Pages 50 and 100
• Pages 10 and 70
• Pages 40 and 60