A Survey of 25 Grocery Stores Revealed That the Average

question 56

Multiple Choice

A survey of 25 grocery stores revealed that the average price of a 4-litre bag of milk was $2.98 with a standard error of $0.10. What is the 98% confidence interval to estimate the true cost of a 4-litre bag of milk?

• A) $2.75 to $3.21
• B) $2.85 to $3.11
• C) $2.94 to $3.02
• D) $2.95 to $3.01
• E) $2.77 to $3.19

---

Definitions:

Distribution Transformer

A transformer used in electrical power distribution to step down voltage levels from high to lower levels for consumer use.

Control Transformer

A transformer used to provide a stable voltage supply to control devices in electrical circuits, isolating them from the main power circuit.

Inrush Current

The amount of current that is drawn when an inductive device is first connected to the power line.

Magnetizing

Refers to the process of inducing magnetic properties in a material, usually by placing it within a magnetic field or by passing an electric current through it.