The mean and standard deviation of a random sample of n measurements are equal to 34.4 and 3.6​, respectively. a. Find a 90​% confidence interval for μ if n=64. b. Find a 90​% confidence interval for μ if n=256. c. Find the widths of the confidence intervals found in parts a and b. What is the effect on the width of a confidence interval of quadrupling the sample size while holding the confidence coefficient​ fixed?

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Q: A 90​%confidence interval for μ is  ​(Round to one decimal place as​ needed.)

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.