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A random sample of $n=100$ measurements has been selected from a population with unknown mean $μ$ and known standard deviation $σ=12$. Calculate the width of the confidence interval for $μ$ for the confidence level given below. (Round your answer to three decimal places.) $89%(α=0.11)$ You are given that the width of an $85%$ confidence interval for $μ$ is 3.455 and the width of an $80%$ confidence interval for $μ$ is 3.076. What effect do the changing confidence levels have on the width of the interval? As the confidence coefficient increases, the width of the confidence interval decreases. As the confidence coefficient increases, the width of the confidence interval increases. Changing the confidence coefficient appears to have no effect on the width of the confidence interval.

Given the sample size, n = 100

and, define to be the population mean

also, given the population sta...

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