An Experiment Was Conducted to Determine the Effectiveness of a Method

question 40

Multiple Choice

An experiment was conducted to determine the effectiveness of a method designed to remove oil wastes found in soil.Three contaminated soil samples were treated.After 95 days,the percentage of contamination removed from each soil sample was measured with a mean of 49.3% and a standard deviation of 1.5%.Assume the percentage of contamination is normally distributed.If we wished to narrow the boundary around μ for a 98% confidence interval to within 0.5%,how many soil samples should be in our experiment?

• A)437
• B)33
• C)9
• D)6
• E)3

---

Definitions:

Idea

A thought or suggestion as to a possible course of action or the conception of a possible novelty.

KB

Stands for Kilobyte, a unit of digital information storage equal to 1,024 bytes.

Binary Digits

The smallest unit of data in computing, represented as either 0 or 1, used in the binary numbering system.

Machine Cycles

The basic operations performed by a CPU, such as fetching, decoding, and executing instructions, typically within a few steps or stages.