Does this racquet-spinning study call for a one-sided or a two-sided alternative?
A. One-sided, because there is only one variable: how the label lands
B. Two-sided, because there are two possible outcomes: up or down
C. One-sided, because the researchers want to know whether the label is more likely to land face up
D. Two-sided, because the researchers want to know whether the spinning process is fair or biased in either direction

Reconsider the racquet-spinning Exercise 1.1.1 from earlier. Researchers wanted to investigate whether a spun tennis racquet is equally likely to land with the label facing up or down.