The yield of a chemical process is being studied. The two factors of interest are temperature and pressure. Three levels of each factor are selected; however, only nine runs can be made in one day. The experimenter runs a complete replicate of the design on cach day. The data are shown in the following table. - Group 4

Dayl

Day 2

Temperature

Pressure

Pressure

250

260

270

250

260

270

Low

86.3

84

85.8

86.1

85.2

87.3

Medium

88.5

87.3

89

89.4

89.9

90.3

High

89.1

90.2

91.3

91.7

93.2

93.7

(a) Analyze the data and draw conclusions assuming that the days are blocks. Use a = 0.05

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