A Sample of N = 20 Scores Has a Mean

question 25

Multiple Choice

A sample of n = 20 scores has a mean of M = 45 and a standard deviation of s = 8.In this sample,what is the z-score corresponding to X = 57?​

• A)​z = 12/20 = 0.60
• B)​z = 1.00
• C)​z = 1.50
• D)​z = 2.00

---

Definitions:

Phosphorus

A chemical element essential for life, involved in numerous cellular processes and a critical component of DNA and bone mineral.

Pollution Prevention

The practice of reducing or eliminating waste and pollutants at their sources, prior to recycling, treatment, or disposal.

Freshwater Lake

A large body of standing water that contains low concentrations of dissolved salts, distinct from sea water, providing habitat for a diverse range of organisms.

Cultural Eutrophication

The process by which water bodies become enriched with nutrients from human activity, leading to excessive growth of algae and deterioration of water quality.