When Testing the Difference Between Two Population Means,the Sample Variances

question 38

Multiple Choice

When testing the difference between two population means,the sample variances are pooled to estimate the population variance when ________.

• A)the population variances are known and equal
• B)the population means are known
• C)the population variances are assumed unequal and unknown
• D)the population variances are assumed equal but unknown

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Definitions:

CPT

Current Procedural Terminology, a set of codes used by medical professionals to standardize billing for procedures and services.

ICD

International Classification of Diseases, a coding system used to classify and code diagnoses, symptoms, and procedures.

CPT

Current Procedural Terminology; a set of codes used by healthcare professionals to report and document medical, surgical, and diagnostic services.

ICD

International Classification of Diseases, a system of codes used for classifying diagnoses, symptoms, and procedures.