LEAP Interpreting Scientific Data 2

Question 1

A bar graph shows plant heights after 4 weeks: Group A (no fertilizer) averaged 12 cm, Group B (fertilizer) averaged 19 cm. What does this data best support?

Accepted Answer

Fertilizer increases plant height

Answer

Fertilizer has no effect on plant growth

Answer

Group A plants are healthier than Group B plants

Answer

Both groups grew at the same rate

Question 2

A scientist records water temperature in a lake every hour. The data shows temperature rises from 6 AM to 2 PM, then falls until midnight. What type of variable is time in this experiment?

Accepted Answer

Independent variable

Answer

Dependent variable

Answer

Controlled variable

Answer

Extraneous variable

Question 3

Two students measure the length of the same pencil. Student A records 14.2 cm and Student B records 14.8 cm. What is the most likely source of this difference?

Accepted Answer

Measurement error or different reading techniques

Answer

The pencil changed length between measurements

Answer

Different units were used

Answer

The rulers had different numbers of centimeters

Question 4

A line graph shows CO₂ levels in the atmosphere from 1960 to 2020. The line slopes consistently upward. What conclusion is best supported?

Accepted Answer

CO₂ levels have steadily increased over 60 years

Answer

CO₂ levels fluctuate randomly over time

Answer

CO₂ levels peaked in 1990 and then declined

Answer

There is no trend in CO₂ data

Question 5

In a table of experimental results, which row shows an outlier if the other rows all show reaction times between 0.20 and 0.25 seconds?

Accepted Answer

Trial 9: 0.87 seconds

Answer

Trial 3: 0.22 seconds

Answer

Trial 5: 0.24 seconds

Answer

Trial 7: 0.19 seconds

Question 6

A pie chart shows that 45% of a school's waste is paper, 30% is food, 15% is plastic, and 10% is other. Which waste type makes up the largest share?

Accepted Answer

Paper

Answer

Food

Answer

Plastic

Answer

Other

Question 7

A scientist graphs the relationship between sunlight hours and crop yield. The data points form a positive correlation. What does this mean?

Accepted Answer

As sunlight hours increase, crop yield also increases

Answer

As sunlight hours increase, crop yield decreases

Answer

Sunlight hours have no relationship to crop yield

Answer

Crop yield causes changes in sunlight hours