A Random Sample of Size N Has Been Selected from a Normally

question 33

Multiple Choice

A random sample of size n has been selected from a normally distributed population. In hypothesis testing for the population mean, when should the t test be used instead of the z test?

• A) when n < 30 andis unknown
• B) when n > 30 andis unknown
• C) when n < 30 andis known
• D) both a and c

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Definitions:

Breast Cancer

A malignant tumor that develops from breast cells, considered one of the most common cancers affecting women.

Breast Cancer

A type of cancer that forms in the cells of the breasts, one of the most common cancers among women worldwide.

Developed

Achieved a high level of industrialization, infrastructure, and standard of living.

Breast Cancer Death Rate

The mortality rate associated with breast cancer, indicating the number of deaths per a given population over a specified time period.