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Chapter 10: Q. 41 (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.

State the null and alternative hypotheses.

Short Answer

Expert verified

Subscripts : 1= Gamma, 2= Zeta

H0:渭1=渭2

H0:渭1鈮�渭2

Step by step solution

01

Given Information

The table is


Sample Mean Melting TemperaturesF0


Population Standard Deviation
Alloy Gamma80095
Alloy Zeta900105
02

State the null and alternative hypotheses.

The null and alternative hypotheses is given by,

Subscripts : 1= Gamma, 2= Zeta

H0:渭1=渭2

H0:渭1鈮�渭2

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Use the following information to answer the next 15 exercises: Indicate if the hypothesis test is for

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b. independent group means, population standard deviations, and/or variances unknown

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