What Sample Size Is Needed to Obtain a 90 Percent

question 25

Multiple Choice

What sample size is needed to obtain a 90 percent confidence interval for the mean protein content of meat if the estimate is to be within 2 pounds of the true mean value? Assume that the variance is 49 pounds.

• A) 34
• B) 1625
• C) 21
• D) 987

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Definitions:

Mycorrhizae

A symbiotic association between a fungus and the roots of a vascular host plant, enhancing nutrient and water absorption.

Fungi

A kingdom of spore-producing organisms that feed on organic matter, including molds, yeast, and mushrooms.

Plant Roots

The underground part of a plant that serves to anchor it, absorb water and nutrients, and store food.

Reef-Building Coral

Marine invertebrates in the order Scleractinia that produce calcium carbonate skeletons, forming the structure of coral reefs.