A random sample of 70 observations from a normally distributed population possesses a sample mean equal to
Question:
a. Find an approximate 95% confidence interval for μ.
b. What do you mean when you say that a confidence coefficient is .95?
c. Find an approximate 99% confidence interval for μ.
d. What happens to the width of a confidence interval as the value of the confidence coefficient is increased while the sample size is held fixed?
e. Would your confidence intervals of parts a and c be valid if the distribution of the original population was not normal? Explain
Distribution
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a For confidence coefficient 95 05 and 2 05 2 025 From Table II ...View the full answer
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Related Book For 
Statistics For Business And Economics
ISBN: 9780134506593
13th Edition
Authors: James T. McClave, P. George Benson, Terry Sincich
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