A Random Sample of 250 Students at a University Finds $15.8 \pm .010$

question 79

Multiple Choice

A random sample of 250 students at a university finds that these students take a mean of 15.8 credit hours per quarter with a standard deviation of 2.3 credit hours. Estimate the mean credit
Hours taken by a student each quarter using a 90% confidence interval. Round to the nearest
Thousandth.

• A) \(15.8 \pm .010\)
• B) \(15.8 \pm .158\)
• C) \(15.8 \pm .239\)
• D) \(15.8 \pm .015\)

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Definitions:

Oxytocin

A hormone and neuropeptide that plays a role in social bonding, sexual reproduction, and during and after childbirth.

Calcitonin

A hormone produced by the thyroid gland that helps regulate calcium levels in the blood by inhibiting bone resorption.

Glucagon

A substance secreted by the pancreas which increases blood sugar levels by encouraging the liver to break down glycogen and release glucose.

Uterine Contractions

The tightening and relaxing of the uterine muscles, important in childbirth and menstruation.