An Elementary School Principal Wants to Know the Mean Number

question 92

Multiple Choice

An elementary school principal wants to know the mean number of children in families whose
Children attend this school. He checks all the families using the school's registration records, and we
Create a 95% confidence interval based on a t-distribution. This procedure was not appropriate.
Why?

• A) Since these families are from only one school, the family sizes may be skewed.
• B) At a given school families are not randomly selected.
• C) The entire population of families was gathered so there is no reason to do inference.
• D) The recent record-setting family with twelve children is probably an outlier.
• E) The population standard deviation is known, so he should have used a z-model.

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Definitions:

Plasma

The liquid component of blood, composed of water, salts, proteins, and various other substances, in which blood cells are suspended.

Transferrin

A plasma protein that transports iron throughout the body.

Erythrocytes

Red blood cells that are primarily responsible for carrying oxygen and carbon dioxide throughout the body.

Amino Acids

Organic compounds that combine to form proteins, which are the building blocks of life.