(1 point) The thickness of eight pads designed for use in aircraft engine mounds

Question

(1 point) The thickness of eight pads designed for use in aircraft engine mounds were measured. The results, in mm, were 40.95 40.25 41.81 40.36 41.29 41.8 41.23 40.9 Using = 0.05, can you conclude that the mean thickness is greater than 41 by computing the following: (a) the degree of freedom (b) the critical t value (c) the test statistics The final conclusion is A. We reject the null hypothesis. B. There is not sufficient evidence to reject the null hypothesis. Our results provide that there is evidence that the mean thickness is not greater than 41

Explanation / Answer

N=8

a)DF=8-1=7

b)1.89457861

at DF=7 and alpha =0.05

c) mean =41.07375

Sd =0.5824

mu=41

T= x-mu/(s/sqft(n))

=41.07375-41/(0.5824/sqrt(8))

=0.358178

Here t test value not in rejection region

Therefore failed to reject null hypothesis.

There is insufficient evidence to reject null hypothesis

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