Before doing any actual hypothesis testing, you should examine your data visually to get a picture of the effects. Use the Line Chart feature in the Graphs menu to obtain the plot of mean thickness versus pressure by temperature. What do you conclude about the effects of temperature and pressure on thickness? Can you conclude that one of the two factors affects thickness more than the other? What combinations of the factor-levels produce the thinnest and the thickest coatings? (b) Use the Means procedure in the Compare Means submenu in the Statistics menu to obtain the table of the marginal means of thickness for all combinations of temperature and pressure. Temperature and pressure should be entered as two layers in the procedure. What do you conclude about the effects of the two factors on thickness