In a Study Using 8 Samples, and in Which the Population

question 46

Multiple Choice

In a study using 8 samples, and in which the population variance is unknown, the distribution that should be used to calculate confidence intervals is

• A) a t distribution with 9 degrees of freedom.
• B) a t distribution with 7 degrees of freedom.
• C) a standard normal distribution.
• D) a t distribution with 8 degrees of freedom.

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Definitions:

Crocodilians

Large aquatic reptiles that include crocodiles, alligators, caimans, and the gharial, known for their tough skin, sharp teeth, and strong jaws.

Reptile Group

A category of ectothermic, vertebrate animals primarily characterized by their ability to lay eggs on land and having scales or scutes.

Birds

A group of endothermic vertebrates characterized by feathers, beaks without teeth, laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.

Amniote

Vertebrate whose egg has waterproof membranes that allow the embryo to develop away from water; a reptile, bird, or mammal.