According to a money report by a governmentinstitution, 18-to-20-year-old college students have an average credit card balance of $569. A researcher wants to find out if this number is lower now and collects data for a random sample of 40 college students. Their average credit card debt was found to be $545 with a sample standard deviation of $67.98. Complete parts a through c.

Determine the appropriate critical value. Select the correct choice below and fill in the answer box within your choice.

(Round to three decimal places asneeded.)

A.

t=______

B.

t=______

C.

t/2=________

1. calculate the test statistic
2. p-value is?