Answer the following question: When the population standard deviation is unknown a .There will be a large amount of sampling error.

Answer the following question:

Q: When the population standard deviation is unknown

a .There will be a large amount of sampling error.

b. The resulting margin of error for a confidence interval estimate will tend to be fairly small.

c. The t-distribution must be used to obtain the critical value.

d. The critical value will be negative.