In Constructing a 95% Confidence Interval Estimate for the Difference

question 107

Multiple Choice

In constructing a 95% confidence interval estimate for the difference between the means of two normally distributed populations, where the unknown population variances are assumed not to be equal, summary statistics computed from two independent samples are: , , , , , and . The upper confidence limit is:

• A) 18.78
• B) 6.78
• C) 5.76
• D) 77.3
• E) 89.3

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Definitions:

Alimentary Canal

The alimentary canal is the whole passage along which food passes through the body from mouth to anus, including the esophagus, stomach, and intestines, digesting and absorbing food along the way.

Esophagus

The muscular tube that transports food from the throat to the stomach by a series of coordinated muscle movements.

Oral Cavity

The mouth’s interior space, including the lips, gums, front portion of the tongue, and teeth, which plays a role in speech, digestion, and respiration.

Splenic Flexure

The part of the large intestine that connects the transverse colon to the descending colon, located near the spleen.