When the background music tempo was slow, the mean amount of bar purchases for a sample of 20 restaurant patrons was $30.41 with a standard deviation of $15.90. When the background music tempo was fast, the mean amount of bar purchases for a sample of 15 patrons in the same restaurant was $21.32 with a standard deviation of $9.90.

Assuming equal variances, at= 0.01, is the true mean higher when the music is slow?

(a-2)Calculate thet_calc.(Round your answer to 3 decimal places.)

t_calc