Question 451288
The net weights of a sample of bottles filled by a machine manufactured by Edne, and the net weights of a sample filled by a similar machine manufactured by Orno, Inc., are (in grams): 
Edne: 5, 8, 7, 6, 9 and 7 
Orno: 8, 10, 7, 11, 9, 12, 14 and 9 
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Testing the claim at the 0.05 level the mean weight of the bottles filled by the Orno machine is greater than the mean weight of the bottles filled by the Edne machine, what is the critical value?
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Ho: u(orno)-u(edne) <= 0
Ha: u(orno)-u(edne) > 0 (claim)
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I ran a 2SampleTtest against the data on my TI-84 and got the following:
test statistic: t = -1.1907
critical value: invT(0.95 with df = 5) = 2.0150
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I used df= 6-1 = 5
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You will get different answers depending on how
your text determines df for 2 independent samples.
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Cheers,
Stan H.
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A. –1.96
B. –2.837
C. –6.271
D. +3.674
E. None of the above