A Test of Spelling Ability Is Given to a Random

question 25

Multiple Choice

A test of spelling ability is given to a random sample of 10 students before and after they completed a spelling course.The mean score before the course was 119.60 and after the course the mean score was 130.80.The standard deviation of the difference was 16.061.Based on this information,the t-test statistic is _____.

• A)1.12
• B)1.02
• C)1.61
• D)2.01
• E)2.21

---

Definitions:

Utility Gloves

Gloves designed for general work or specific utilities to protect hands from various hazards.

Acidic-pH Detergent

Cleaning agents designed to work optimally in low pH conditions, often used for dissolving mineral deposits and rust.

Pathogenic Microorganisms

Harmful bacteria, viruses, or other microbes that can cause diseases or infections in humans and other organisms.

Bacterial Spores

Bacterial spores are highly resistant, dormant structures formed by some bacteria to survive in adverse environmental conditions.