For a sample 1000 Twitter users, Tele-Market Research reports an average age of 39.If the population standard deviation is 9.5 years, what would be the upper bound for an 80% confidence interval estimate of the mean age of all Twitter users?
A)42.37
B)39.38
C)41.30
D)39.62
E)43.13

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The Answer of For a sample 1000 Twitter users, Tele-Market Research reports an average age of 39.If the population standard deviation is 9.5 years, what would be the upper bound for an 80% confidence interval estimate of the mean age of all Twitter users?
A)42.37
B)39.38
C)41.30
D)39.62
E)43.13

For a Sample 1000 Twitter Users, Tele-Market Research Reports an Average