Answer
There is sufficient evidence to support the claim that a lavender odor encourages customers to stay longer in the restaurant.
Work Step by Step
Place the digits of the tens to the middle between two vertical lines and the digits of the ones of every data value of No odor to the left of the vertical lines and every data value of lavender odor to the right of the vertical line.
The distributions appear to be roughly Normal, because most of the values lie in the middle of the stemplots, and thus it is appropriate to use the t procedures.
