Math Problem Statement
(CO 4) In a situation where the standard deviation was decreased from 5.8 to 3.1, what would be the impact on the confidence interval?
Group of answer choices
It would become wider due to using the t distribution
It would become narrower due to using the z distribution
It would remain the same as the standard deviation does impact the interval
It would become narrower due to the change in standard deviation
Solution
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Math Problem Analysis
Mathematical Concepts
Statistics
Confidence Intervals
Standard Deviation
Formulas
CI = \bar{x} \pm t_{\alpha/2} \left(\frac{s}{\sqrt{n}}\right)
Theorems
-
Suitable Grade Level
Advanced High School
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