Scatterplot Regression Review

Which scatterplot suggests a linear relationship between x and y?

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Which scatterplot does NOT suggest a linear relationship between x and y?

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Graph has a slope of 1/2 and a y- intercept of 1.  Write the equation in slope - intercept form

• y = 1x+1/2

• y = 1/2x + 1

The LSRL y = 1.4x + 47 attempts to predict students' scores on an upcoming test from the time spent studying (minutes). What does the y-intercept represent in this scenario?

• We predict that students will study an average of 47 minutes

• We predict that students will score an average of 47 points when they study 1.4 hours

• Students are predicted to earn 1.4 more points on average for each additional minute spent studying

• Students who do not study are predicted to earn 47 points on average.

Estimate the correlation coefficient for this scatterplot.

• r = 0.56

• r = -0.56

• r = 0.92

• r = -0.92

The equation shows the predicted monthly income for a waitress based on the number of hours worked. Interpret the SLOPE of the Least Squares Line Equation.

• Income typically decreases by $242.30 with each additional hour worked.

• The average income is $31.45

• For each additional hour worked, income typically increases by $31.45

• Waitresses typically make $242.30 every 31.45 hours.

To describe the form of a scatterplot, we use:

• Positive/Negative

• Linear/Non-Linear

• Weak/Moderate/Strong

• Outliers

Estimating a value outside a set of data is...

• Dependent variable

• Independent variable

• Interpolation

• Extrapolation

To describe the direction of a scatterplot, we use:

• Positive/Negative

• Linear/Non-Linear

• Weak/Moderate/Strong

• Outliers

To describe the strength of a scatterplot, we use:

• Positive/Negative

• Linear/Non-Linear

• Weak/Moderate/Strong

• Outliers