Question
In: Statistics and Probability
To study the effect of curing temperature on shear strength of a certain rubber compound, 80...
To study the effect of curing temperature on shear strength of a certain rubber compound, 80 specimens were cured at 150°C and 105 were cured at 130°C. The specimens cured at 150°C had an average shear strength of 620 psi, with a standard deviation of 20 psi. Those cured at 130°C had an average shear strength of 750 psi, with a standard deviation of 30 psi. Let μXμX represent the population mean strength for the specimens cured at 130°C and let μYμY represent the population mean strength for the specimens cured at 150°C. Find a 95% confidence interval for the difference μX−μYμX−μY . Round the answers to two decimal places.
Solutions
Expert Solution
Solution:
• 95% CI for difference of ux - uy is:
(122.34, 137.66)
calculation:
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70°C
37
35
30
27
36
35
39
39
35
42
28
37
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32
38
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Yield
100
56.17
110
72.28
120
75.68
130
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Temperature
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60°C
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31
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60°C
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34
28
27
24
29
32
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32
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Construct an analysis of
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p-value to four decimal places.
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Temperature
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60°C
70°C
30
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29
35
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Sum of
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Degrees of
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Mean Square
F
p-value
Treatments
Error
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