I If We Are Testing for the Difference Between Two $\pm$

question 15

Multiple Choice

i. If we are testing for the difference between two population means, it is assumed that the sample observations from one population are independent of the sample observations from the other population. ii. If we are testing for the difference between two population means, it is assumed that the two populations are approximately normal and have equal variances.
iii. The critical value of t for a two-tail test of the difference of two means, a level of significance of 0.10 and sample sizes of seven and fifteen, is $\pm$ 1.734.

• A) (i), (ii), and (iii) are all correct statements.
• B) (i) and (ii) are correct statements but not (iii).
• C) (i) and (iii) are correct statements but not (ii).
• D) (ii) and (iii) are correct statements but not (i).
• E) (i), (ii), and (iii) are all false statements.

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Definitions:

Retailers

Businesses or individuals that sell goods directly to consumers for personal use, rather than for resale or wholesale.

Wholesalers

Entities engaged in selling goods in large quantities to retailers, other merchants, or industrial, institutional, and commercial users.

North American Industry Classification System

A classification system that categorizes businesses into detailed sectors and industries, primarily to facilitate economic data analysis and reporting.

NAICS

The North American Industry Classification System; a standard used by federal statistical agencies for classifying business establishments for the purpose of collecting, analyzing, and publishing statistical data related to the U.S. economy.