A Test of Writing Ability Is Given to a Random

question 23

Multiple Choice

A test of writing ability is given to a random sample of students before and after they completed a formal writing course.The results are given below.Construct a 99% confidence interval for the mean difference between the before and after scores if
(before-after) = 2.0 and
=2.6457

• A)(-0.2,4.2)
• B)(-0.1,4.1)
• C)(-13.6,17.6)
• D)(1.2,2.8)
• E)(-0.5,4.5)

---

Definitions:

Small-Business

A privately owned corporation, partnership, or sole proprietorship that has fewer employees and generates less revenue than a regular-sized business.

Noninvestment Company

A company primarily engaged in businesses other than investing, reinvesting, owning, holding, or trading in securities.

Midsize-Business

A company that occupies the middle ground in terms of its size and revenue, between small businesses and large corporations.

Registration Requirements

Legal or regulatory mandates that entities must fulfill to register a product, business, or activity with the relevant authorities.