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Chapter 10: Q.42 (page 598)

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 normal distributions. The following table is the result. It is believed that Alloy Zeta has a different melting point.

Is this a right-, left-, or two-tailed test?

Short Answer

Expert verified

Because the alternate hypothesis is testing for differences in melting points of two alloys with no mention of direction, this is a two-tailed test.

Step by step solution

01

Given Information

The table is


Sample Mean Melting TemperaturesF0

Population Standard Deviation
Alloy Gamma80095
Alloy Zeta900105
02

Is this a right-, left-, or two-tailed test

Because the alternate hypothesis is testing for differences in melting points of two alloys with no mention of direction, this is a two-tailed test.

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