Math Problem Statement
You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 20.
While it is an uncommon confidence level, find the critical value that corresponds to a confidence level of 95.5%. (Report answer accurate to three decimal places with appropriate rounding.)
ta/2 = ±
Solution
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Math Problem Analysis
Mathematical Concepts
Statistics
Confidence Interval
t-Distribution
Formulas
tα/2 = ± critical value for confidence interval
Degrees of freedom: df = n - 1
Theorems
Central Limit Theorem
Properties of t-Distribution for small samples
Suitable Grade Level
College Level
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