Find a 90 confidence interval for the difference between

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Reference no: EM13636059

The following summary data on proportional stress limits for two different type of woods, Red oak and Douglas fir.

Type of Wood

Sample Size

Sample Mean

Sample

Standard Deviation

Red oak

8.51

1.52

Douglas fir

7.69

3.25

a) Find a 90% confidence interval for the difference between true average proportional stress limits for the Red oak and that for the Douglas fir. Interpret your result.

b) A test of hypotheses is conducted at ?=0.10 to determine if the stress limits are the same for the two type of woods. Explain how you can use the confidence interval in part (a) to draw a conclusion in the test of hypotheses.

Reference no: EM13636059

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