A random sample of 100 observations from a normally distributed population possesses a mean equal to 76.7
Question:
A random sample of 100 observations from a normally distributed population possesses a mean equal to 76.7 and a standard deviation equal to 7.9.
a. Find a 90% confidence interval for m.
b. What do you mean when you say that a confidence coefficient is .90?
c. Find a 95% confidence interval for m.
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 were not normal? Explain.
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Related Book For 
Statistics Plus New Mylab Statistics With Pearson Etext Access Card Package
ISBN: 978-0134090436
13th Edition
Authors: James Mcclave ,Terry Sincich
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