Use the Following Information to Answer Questions (11)-(13)

Essay

Use the following information to answer questions (11)-(13). According to the website www.costofwedding.com, the
average cost of catering a wedding (with an open bar) is $100 per person. Recently, in a random sample of 40
weddings in the U. S. it was found that the average catering cost was $110, with a standard deviation of $12. On the
basis of this, a 95% confidence interval for the mean catering cost for a wedding is $106 to $114.
-Verify that the conditions for a valid confidence interval are met.