$295.89 with a standard deviation of $48.76. The average airticket price for group 2 is $304.76 with a standard deviation of $59.05. Conduct a hypothesis testat 5% level of significance to determine if air tickets are cheaper if you purchase them at least 3months in advance compared to a few days before the trip.

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.