A study of elephants wishes to determine the average weight of a certain subspecies of elephants. The standard deviation of the population is 2000 pounds. How many elephants need to be weighed so find we
Can be 80% confident to be accurate within 300 pounds?
A) 73
B) 94
C) 121
D) 400

Question

Quizplus · Accepted Answer

The sample size needed to be 80% confident to be accurate within 300 pounds is 73. This is calculated using the formula n = (Z^2 * s^2) / e^2, where Z is the z-score for the desired confidence level, s is the standard deviation of the population, and e is the margin of error. In this case, Z = 1.28 (for a 80% confidence level), s = 2000, and e = 300. Plugging these values into the formula, we get n = (1.28^2 * 2000^2) / 300^2 = 73.

A Study of Elephants Wishes to Determine the Average Weight