The graph summarizes 48 test flights of two delivery-drone models.

Question

https://gmatclub.com/forum/download/file.php?id=89567 The graph summarizes 48 test flights of two delivery-drone models. Each point represents one test flight. The horizontal coordinate indicates the payload carried during the flight, in kilograms, and the vertical coordinate indicates the flight time, in minutes. The two types of markers distinguish Model A from Model B, and a regression line is shown for each model. Choose the option in each drop-down that makes the statement accurate based on the graph. For Model B, the relationship between payload and flight time is GRAPH_1_PLACEHOLDER . The slope of the regression line for Model A is GRAPH_2_PLACEHOLDER the slope of the regression line for Model B. GMAT-Club-Forum-qbt544wm.png

Bunuel · Accepted Answer

https://gmatclub.com/forum/download/file.php?id=89567

The graph summarizes 48 test flights of two delivery-drone models. Each point represents one test flight. The horizontal coordinate indicates the payload carried during the flight, in kilograms, and the vertical coordinate indicates the flight time, in minutes. The two types of markers distinguish Model A from Model B, and a regression line is shown for each model.

Choose the option in each drop-down that makes the statement accurate based on the graph.

For Model B, the relationship between payload and flight time is  GRAPH_1_PLACEHOLDER .

The slope of the regression line for Model A is  GRAPH_2_PLACEHOLDER  the slope of the regression line for Model B.

Official Solution:

Drop-down 1:

A regression line summarizes the overall relationship between two variables. If the line slopes upward, the relationship is positive, if it slopes downward, the relationship is negative, and if it is approximately horizontal, there is little or no linear relationship.

For Model B, the regression line slopes downward, meaning that heavier payloads tend to be associated with shorter flight times. Therefore, the relationship between payload and flight time for Model B is  negative .

Drop-down 2:

Both regression lines slope downward, but the regression line for Model A is  steeper  than the regression line for Model B. Therefore, the absolute value of the slope for Model A is larger.

Since both slopes are negative, the steeper line has the more negative, and therefore smaller, slope. Thus, the slope of the regression line for Model A is  less than  the slope of the regression line for Model B.

Correct answer:  
Drop-down 1: "negative"
Drop-down 2: "less than"

LogicDriven · Answer

Part 1:

For Model B, the relationship between payload and flight time is: Negative

Reasoning: As payload increases along the x-axis, flight time decreases along the y-axis

Part 2:
The slope of the regression line for Model A is:  less than  the slope of the regression line for Model B.
Reasoning: Both regression lines have negative slopes. Model A's line is steeper downwards

.

The graph summarizes 48 test flights of two delivery-drone models.

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The graph summarizes 48 test flights of two delivery-drone models.

Prep Toolkit

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