Which relationships would most likely be causal? check all that apply.

a positive correlation between the number of homework assignments completed and the grade on the exam
a positive correlation between the temperature in a canyon in the early spring and the number of snakes seen by hikers
a positive correlation between a child’s shoe size and reading speed
a negative correlation between the time a glass of ice water sits on the counter and its temperature
a positive correlation between the number of students attending football games and the number of games that are won