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Use the following information to answer the next five exercises. Two metal alloys are being considered as material for ball bearings. The mean melting point of the two alloys is to be compared. 15 pieces of each metal are being tested. Both populations have
Sample Mean Melting Temperatures (°F) | Population Standard Deviation | |
Alloy Gamma | 800 | 95 |
Alloy Zeta | 900 | 105 |
Table 10.20
Is this a right-, left-, or two-tailed test?

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