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Tennis players often spin a racquet to decide who serves first. The spun racquet can land with the manufacturer's label facing up or down. A reasonable question to investigate is whether a spun tennis racquet is equally likely to land with the label facing up or down. (If the spun racquet is equally likely to land with the label facing in either direction, we say that the spinning process is fair.) Suppose that you gather data by spinning your tennis racquet 100 times, each time recording whether it lands with the label facing up or down.

Does this racquet-spinning study call for a one-sided or a two-sided alternative?

Two-sided, because the researchers want to know whether the spinning process is fair or biased in either direction.

One-sided, because the researchers want to know whether the label is more likely to land face up.

One-sided, because there is only one variable: how the label lands.

Two-sided, because there are two possible outcomes: up or down.