If Two Random Samples of Sizes 30 and 36 Are $\bar { X } _ { 1 } - \bar { X } _ { 2 }$

question 64

Multiple Choice

If two random samples of sizes 30 and 36 are selected independently from two populations with means 78 and 85,and standard deviations 12 and 15,respectively,then the mean of the difference $\bar { X } _ { 1 } - \bar { X } _ { 2 }$ is equal to:

• A) -7
• B) 7
• C) (78 -85)/ (30 - 36)= 1.17
• D) 78/30 - 85/36 = 0.24

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Definitions:

Weighted Average Method

An inventory costing method that assigns a cost to inventory on the basis of the average cost of all similar goods available during a certain period.

Direct Labor

Labor costs directly associated with the manufacturing of products or the provision of services, which vary with the production volume.

Materials Flow

Materials flow describes the movement of raw materials, work-in-progress, and finished goods through various stages of production and supply chain.

Process Costing System

An accounting method used to allocate costs to units of product in processes where the products are indistinguishable from each other.