In a Metal Fabrication Process, Metal Rods Are Produced to a Specified

question 9

Multiple Choice

In a metal fabrication process, metal rods are produced to a specified target length of 15 feet. Suppose that the lengths are normally distributed. A quality control specialist
Collects a random sample of 16 rods and finds the sample mean length to be 14.8 feet and
A standard deviation of 0.65 feet. Which of the following statements is true?

• A) The sampling distribution for the sample mean follows the t-distribution with 16
• Degrees of freedom.
• B) The sampling distribution for the sample mean follows the t-distribution with 15
• Degrees of freedom.
• C) The mean of the sampling distribution for the sample mean is 14.8 feet.
• D) The sampling distribution for the sample mean is Normal with a mean of 14.8 feet
• And standard deviation of .65 feet.
• E) The standard error is 0.65 feet.

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Definitions:

Amoeboid Cells

Cells that move or feed by forming extensions of their cytoplasm, known as pseudopodia.

Rhizarians

A diverse supergroup of amoeboid cells that often have hard outer shells, called tests, through which cytoplasmic projections extend; include forams, actinopods, and certain shell-less amoebas.

Unikonts

A group of eukaryotic organisms that include amoebas, most animals, and fungi, characterized by a single emergent flagellum.

Evolutionary Significance

The impact or importance of evolutionary changes and adaptations in the history and development of species, populations, or genes.