Find a 90 Percent Confidence Interval for the Difference Between

question 106

Multiple Choice

Find a 90 percent confidence interval for the difference between the proportions of Group l and Group 2.Let p₁ represent the population proportion of the people in group 1 who are in favor of new packaging and Let p₂ represent the population proportion of the people in group 2 who are in favor of new packaging,where ₁ = .21, ₂ = .13,n₁= 300,n₂ = 400.

• A)(.0472 .1128)
• B)(.0510 .1090)
• C)(.0232 .1368)
• D)(.0324 .1276)

---

Definitions:

Sleep Spindles

Bursts of oscillatory brain activity visible on an EEG that occur during stage 2 of NREM sleep, believed to play a role in learning and memory consolidation.

N1 Sleep

The initial stage of sleep in a typical sleep cycle, characterized by light sleep from which one can be easily awakened.

Hallucinations

Perceptual experiences that occur without an external stimulus, vivid and clear, with the full force and impact of normal perceptions, not under voluntary control.

Delta Waves

Slow brain waves associated with deep sleep and restorative processes in the brain.