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A random sample of n measurements was selected from a population with unknown mean μ and standard deviation σ=15 for each of the situations in parts a through d. Calculate a 90​% confidence interval for μ for each of these situations.   a. n=50​, x=26 b. n=150​, x=115 c. n=80​, x=18 d. n=80​, x=4.76 e. Is the assumption that the underlying population of measurements is normally distributed necessary to ensure the validity of the confidence intervals in parts a through​ d? Explain. a. (  ,  ) b. (  ,  ) c. (  ,  ) d. (  ,  ) e.

A random sample of n measurements was selected from a population with unknown mean μ and standard deviation σ=15 for each of the situations in parts a through d. Calculate a 90​% confidence interval for μ for each of these situations.

a. n=50​, x=26
b. n=150​, x=115
c. n=80​, x=18
d. n=80​, x=4.76
e. Is the assumption that the underlying population of measurements is normally distributed necessary to ensure the validity of the confidence intervals in parts a through​ d? Explain.
a. (  ,  )
b. (  ,  )
c. (  ,  )
d. (  ,  )
e.
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