Use the following information to answer the question. Many couples believe that it is getting too expensive to host an "average" wedding in the United States. According to the website HYPERLINK "http://www.costofwedding.com/" www.costofwedding.com, the average cost of a wedding in the U.S. in 2009 was $24,066. Recently, in a random sample of 40 weddings in the U.S. it was found that the average cost of a wedding was $23,224, with a standard deviation of $2,903. On the basis of this, a 95% confidence interval for the mean cost of weddings in the U.S. is $22,296 to $24,152.
-Does the confidence interval provide evidence that the mean cost of a wedding has decreased?
A)No
B)Yes

Question

Quizplus · Accepted Answer

The 95% confidence interval ($22,296 to $24,152) includes the 2009 average cost of $24,066, indicating there is not enough evidence to conclude that the mean cost has decreased.

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