Help with multivariate analysis

[Welshlad06]

The design specification states that the thickness of the wafers should be 300um and the surface roughness should be 20nm. Is there any evidence that the specification is not being satisfied? Formulate and test a suitable hypothesis. What do you conclude. What have you assumed?

Obtain simultaneous confidence intervals for Thick 3 and Rough3. What do you conclude from your confidence intervals?

Thick3 Rough3
300.9 17.72
300.4 19.34
299.3 20.67
294.1 21.68
301.1 22.19
287.8 24.23
295.8 21.83
298.9 17.41
300.2 21.04
299.4 21.77
294.1 25.13
298.1 23.47
298.5 20.03
295.0 21.24
302.6 19.17
297.1 17.70
295.2 23.77
302.4 20.12
298.6 20.81
299.4 21.06
299.1 19.04
299.1 21.35
302.2 16.95
299.0 18.55
298.9 17.85
294.4 23.80
303.9 19.79
298.7 20.82
297.3 25.28
301.1 25.13
301.8 22.54
306.7 16.66
296.4 24.58
291.3 23.46
297.2 21.90
299.4 21.68
304.1 19.49
303.4 16.69
296.3 20.85
299.3 21.76
303.2 19.92
300.5 20.48

[Dason]

http://www.talkstats.com/showthread....ho-show-effort