Question

. Write an executive summary of your study. In the summary, include the ANOVA test results, your hypothesis and its resolution, and the implications of your findings. You must include at least two references (academic sources that must be cited in APA style).

Answer 1

An engineer suspects that the surface finish of a metal part is influenced by the feed rate and the depth of cut. She selects three feed rates and four depths of cut. She then conducts a factorial experiment and the results are below:

0.15 in	0.18 in	0.20 in	0.25 in
0.20 in/min	74	79	82	99
	64	68	88	104
	60	73	92	96
0.20 in/min	92	98	99	104
	86	104	108	110
	88	88	95	99
0.20 in/min	99	104	108	114
	98	99	110	111
	102	95	99	107
Source	SS	df	MS	F	p-value
Feed Rate	3,160.50	2	1,580.25	55.02	1.09E-09
Depth of Cut	2,125.11	3	708.370	24.66	1.65E-07
Interaction	557.06	6	92.843	3.23	.0180
Error	689.33	24	28.722
Total	6,532.00	35

There is a main effect of Feed Rate.

There is a main effect of Depth of Cut.

There is an interaction.