Math Problem Statement
Which will make the confidence interval for a mean for 1 population narrower? Select all that apply.
The formula is or depending on if is known.
Group of answer choices
Decrease confidence level
Decrease sample size
Solution
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Math Problem Analysis
Mathematical Concepts
Statistics
Confidence Intervals
Sampling
Formulas
CI = x̄ ± Z(α/2) * (σ / √n)
CI = x̄ ± t(α/2) * (s / √n)
Theorems
Central Limit Theorem
Suitable Grade Level
College Level Statistics
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