A Statistics Professor at a Large University Hypothesizes That Students

question 26

Multiple Choice

A statistics professor at a large university hypothesizes that students who take statistics in the morning typically do better than those who take it in the afternoon.He takes independently random samples,each of size 36,consisting of students who took a morning and an afternoon class,and compares the scores of each group on a common final exam.He finds that the morning group scored an average of 74 with a standard deviation of 8,while the evening group scored an average of 68 with a standard deviation of 10.The population standard deviation of scores is unknown but is assumed to be equal for morning and evening classes.Let µ₁ andµ₂ represent the population mean final exam scores of statistics' courses offered in the morning and the afternoon,respectively.Compute the appropriate test statistic to analyze the claim at the 1% significance level.

• A) t₇₀ = −2.811
• B) t₇₀ = 2.811
• C) z = −2.811
• D) z = 2.811

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Definitions:

Underapplied

A situation in manufacturing where the allocated overhead costs are less than the actual overhead costs incurred.

Overapplied

A condition where the allocated or applied overhead costs exceed the actual overhead costs incurred, leading to a temporary discrepancy in accounting records.

Predetermined Overhead Rate

A rate used to allocate manufacturing overhead cost to products or job orders, based on expected overhead costs and a chosen allocation base.

Variable Component

A variable component refers to a part of a cost or expense that varies directly with the level of output or activity.