Which of the following statements is true about the t-distribution? a. For small sample sizes, the t-distribution has the same properties as the normal curve. b. For large sample sizes, the t-distribution has the same properties as 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.

Which of the following statements is true about the t-distribution?

a. For small sample sizes, the t-distribution has the same properties as the normal curve.

b. For large sample sizes, the t-distribution has the same properties as 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.

The Correct Answer is: D