A Coffee House Owner Knows That Customers Pour Different Amounts $12.5 \pm 2.228 \left( \frac { 0.5 } { \sqrt { 9 } } \right)$

question 480

Multiple Choice

A coffee house owner knows that customers pour different amounts of coffee into their cups. She Samples cups from 10 costumers she believes to be representative of the customers and weighs the Cups, finding a mean of 12.5 ounces and standard deviation of 0.5 ounces. Assuming these cups of Coffee can be considered a random sample of all cups of coffee which of the following formulas Gives a 95% confidence interval for the mean weight of all cups of coffee?

• A) \(12.5 \pm 2.228 \left( \frac { 0.5 } { \sqrt { 9 } } \right)\)
• B) \(12.5 \pm 2.262 \left( \frac { 0.5 } { \sqrt { 9 } } \right)\)
• C) \(12.5 \pm 1.969 \left( \frac { 0.5 } { \sqrt { 10 } } \right)\)
• D) \(12.5 \pm 2.262 \left( \frac { 0.5 } { \sqrt { 10 } } \right)\)
• E) \(12.5 \pm 2.228 \left( \frac { 0.5 } { \sqrt { 10 } } \right\}\)

---

Definitions:

Relevant

Pertinent or related to the matter at hand, especially in the context of decision-making.

Proprietorship Form

A business organization that is owned and operated by an individual, where there is no legal difference between the owner and the business.

Economic Unit

An economic unit is an entity, such as an individual, household, or company, making decisions regarding the allocation of resources and consumption.

Personal Records

Documentation of an individual's financial transactions and essential personal data.