Refer to the Journal of Relationship Marketing (Vol. 7, 2008) study of the prevalence of blogs and forums at Fortune 500 firms with both English and Chinese Web sites. In a sample of 56 firms that provide blogs and forums as marketing tools, the mean number of blogs/forums per site was 4.25, with a standard deviation of 12.02.
a. Find a 99% confidence interval for the mean number of blogs/forums per site of all Fortune 500 firms that provide blogs and forums as marketing tools.
b. Give a practical interpretation of the interval, part a.
c. The number of blogs/forums per site is known to have a highly skewed distribution. Does this impact the validity of the inference, part b?
For Information: Exercise 2.78