3B-9 Practice

The table shows the number of hours spent studying and the corresponding test scores.

Which linear function best represents this data?

*ROUND TO THE NEAREST THOUSANDTHS PLACE*

• $y=0.182x+60.364$

• $y=1.572x+52.793$

• $y=1.308x+55.596$

• $y=1.091x+57.087$

Use your equation from number one to predict the test score for a student who studies 15 hours.

*ROUND YOUR ANSWER TO THE NEAREST WHOLE NUMBER*

• 73

• 63

• 76

• 75

Based on the correlation coefficient for number one, what type of correlation does the data have?

• Strong, positive correlation

• Strong, negative correlation

• Weak, positive correlation

• Weak, negative correlation

The table shows the relationship between the humerus length in centimeters to the femur length in centimeters.

Which linear function best represents this data?

*ROUND TO THE NEAREST TENTHS PLACE*

• $y=x+12$

• $y=1.4x+0.4$

• $y=1.3x+4.8$

• $y=1.4x+1.8$

Use your equation from number 4 to predict the femur length of a person with a humerus length of 33.5 cm.

*ROUND TO THE NEAREST TENTHS PLACE*

• 47.3 cm

• 48.7 cm

• 45.5 cm

• 48.4 cm

Based on the correlation coefficient from number 4, what type of correlation does this data have?

• Strong, negative correlation

• Strong, positive correlation

• Weak, negative correlation

• Weak, positive correlation

A teacher recorded the number of absences (in a school year) for students and the grade earned in the course. The table shows the data.

What is the linear function for this data?

*ROUND TO THE NEAREST THOUSANDTHS PLACE*

• $y=-0.843x+99.216$

• $y=-0.409x+74.909$

• $y=-0.729x+90.439$

• $y=-0.800x+92.981$

Use your equation from number 7 to predict the grade of a student who had 26 absences in the school year.

*ROUND TO THE NEAREST WHOLE NUMBER*

• 77

• 64

• 71

• 72

Based on the correlation coefficient from number 7, what type of correlation does this data have?

• Strong, positive correlation

• Strong, negative correlation

• Weak, positive correlation

• Weak, negative correlation

The table shows the relationship between students' shoe sizes and their test scores.

What is the linear function that best models this situation?

*ROUND TO THE NEAREST THOUSANDTHS PLACE*

•  $y=-0.784x+77.389$ 

• $y=-1.369x+79.046$

• $y=-14.947x+168.526$

• $y=-1.336x+83.452$