A Random Sample of 81 Credit Sales in a Department

question 17

Short Answer

A random sample of 81 credit sales in a department store showed an average sale of $68.00. From past data, it is known that the standard deviation of the population is $27.00.
a.Determine the standard error of the mean.
b.With a 0.95 probability, what can be said about the size of the margin of error?
c.What is the 95% confidence interval of the population mean?

---

Definitions:

Synthesis

The process of combining different elements or components to form a complex whole, often used in chemistry and biology.

Reversible

Capable of being returned to the original condition or position without altering its basic nature.

Oxidation

A chemical reaction in which a substance loses electrons, often leading to its combination with oxygen.

Energy Conversion

The process of transforming energy from one form to another, such as from chemical energy to mechanical energy.