Disk drive substrates may affect the amplitude of the signal obtained during readback. A manufacturer compares four substrates: aluminum (A), nickel-plated aluminum (B), and two types of glass (C and D). Twenty disk drives will be made, five using each of the substrates. It is felt that operator may have an effect on the drives, so the effects were blocked by operator. The design and responses (in microvolts *10-2) are given in the following table. Substrates ABCO с D 1 8 4 3 2 5 9 11 5 Analyse the data and draw conclusions. Operator 3 7 2 9 2 4 4 9 4 5 3 8 5 3

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DESIGN AND ANALYSIS OF EXPERIMENTS
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Disk drive substrates may affect the amplitude of the signal obtained during readback.
A manufacturer compares four substrates: aluminum (A), nickel-plated aluminum (B),
and two types of glass (C and D). Twenty disk drives will be made, five using each of
the substrates. It is felt that operator may have an effect on the drives, so the effects
were blocked by operator. The design and responses (in microvolts ×10-²) are given
in the following table.
Substrates
A
B
с
D
1
8
4
3
2
5
9
11
5
Analyse the data and draw conclusions.
Operator
3
7
2
9
2
4
4
9
4
5
3
∞0 w
8
5
3
Transcribed Image Text:Disk drive substrates may affect the amplitude of the signal obtained during readback. A manufacturer compares four substrates: aluminum (A), nickel-plated aluminum (B), and two types of glass (C and D). Twenty disk drives will be made, five using each of the substrates. It is felt that operator may have an effect on the drives, so the effects were blocked by operator. The design and responses (in microvolts ×10-²) are given in the following table. Substrates A B с D 1 8 4 3 2 5 9 11 5 Analyse the data and draw conclusions. Operator 3 7 2 9 2 4 4 9 4 5 3 ∞0 w 8 5 3
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