A Population of Flights Can Be Classified According to Two

Multiple Choice

A population of flights can be classified according to two factors: duration (short, medium, or long) and purpose (vacation or business) . We are interested in whether either of these factors has an effect on price. The table below gives mean prices for a balanced population and shows the presence of interactions. If a study is conducted and we think there may be interactions, we should:

A) find the F test for interaction first and, if the P-value is small enough to reject the null hypothesis of no interaction, assess the effects of distance separately for business and vacation flights.
B) test for effects of distance first and, if there is no distance effect, ignore the interactions.
C) find the F tests for distance effects and for type of trip and, if there is no effect for either, declare that all the means are the same.
D) drop observations that cause the interaction and repeat the analysis.