Suppose You Want to Estimate the Difference Between Two Population $\mathrm { n } _ { 1 } = \mathrm { n } _ { 2 } = 1203$

question 66

Multiple Choice

Suppose you want to estimate the difference between two population proportions correct to within 0.03 with probability 0.90. If prior information suggests that p1 ≈ 0.4 and p2 ≈ 0.8, and you want to
Select independent random samples of equal size from the populations, how large should the
Sample sizes be?

• A) \(\mathrm { n } _ { 1 } = \mathrm { n } _ { 2 } = 1203\)
• B) \(n _ { 1 } = n _ { 2 } = 1925\)
• C) \(\mathrm { n } _ { 1 } = \mathrm { n } _ { 2 } = 1708\)
• D) \(\mathrm { n } _ { 1 } = \mathrm { n } _ { 2 } = 963\)

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Definitions:

Groundwater

Water that occupies the pores and fractures in rock and soil beneath the Earth's surface, an important source of fresh water.

Lake

A large body of water surrounded by land, often formed by tectonic, volcanic, or glacial activity.

Groundwater

The water found under the surface of the Earth, occupying spaces in soil and cracks in geological formations.

Cross Section

A plane or surface cut through an object or structure, typically used to reveal its internal composition or structure.