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

Multiple Choice

Use the following information to answer questions (11) -(13) . According to the website www.costofwedding.com,
the average cost of flowers for a wedding is $698. Recently, in a random sample of 40 weddings in the U. S. it
was found that the average cost of the flowers was $734, with a standard deviation of $102. On the basis of this, a
95% confidence interval for the mean cost of flowers for a wedding is $701 to $767.
-Which of the following statements is true about the t-distribution?

A) For small sample sizes, the t-distribution has the same properties of the normal curve.
B) For large sample sizes, the t-distribution has the same properties of the normal curve.
C) Like the Normal distribution, the t-distribution is symmetric for small n.
D) Since population standard deviation is usually unknown, the standard error uses the sample standard deviation to estimate population standard deviation.