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Two Ways ANOVA An engineer suspects that the surface finish of a metal part is influenced by...

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Statistics

Two Ways ANOVA

An engineer suspects that the surface finish of a metal part isinfluenced by the feed rate and the depth of cut. She selects threefeed rates and four depths of cut. She then conducts a factorialexperiment and obtains the following data: (Use Minitab)

Depth of

Cut (in)

Feed Rate (in/min)

0.15

0.18

0.20

0.25

74

79

82

99

0.20

64

68

88

104

60

73

92

96

92

98

99

104

0.25

86

104

108

110

88

88

95

99

99

104

108

114

0.30

98

99

110

111

102

95

99

107

  1. Analyze the data and draw conclusions. Use a =0.05.
  2. Prepare appropriate residual plots and comment on the model’sadequacy.
  3. Obtain point estimates of the mean surface finish at each feedrate.

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