Association and Causation

When the number of people in a bus increases, the number of animals in a zoo also increases.

When the number of hours worked each week by an hourly employee decreases, the amount of money earned by the employee also decreases.

When the amount of a discount for a sale increases, the number of items sold during the sale decreases.

When the number of bike trails in a city decreases, the amount of rainfall in the city increases.

When the number of spectators at a football game increases, the number of wins for the home team increases.

When more gallons of water are put into an aquarium, the weight of the aquarium increases.

When the amount of time an athlete runs increases, the distance she runs increases.

When the charge of a cell phone battery increases, the number of minutes the phone can be used increases.

The length of a rectangle affects the width of the rectangle.

The amount of time a cell phone is used affects the charge of its battery.

The number of ice-cream bars sold affects the number of milkshakes sold.

The number of soccer balls a team owns affects the number of games the team wins during the soccer season.

When the student population at a school increases, the number of teachers at the school increases.

When the amount of sugar in a quart of apple juice is reduced, there are fewer calories in each serving.

When there are more workers on a project, the project is completed in less time.

When there is more protein in an athlete’s diet, the athlete scores more points in a game.

When the number of bus stops increases, the number of car sales decreases.

When fewer firefighters report to a house fire, the damage caused by the fire decreases.

When ice cream sales increase, incidents of sunburn increase.

When it rains several inches, the water level of a lake increases.