In a recent survey, the average amount of money students have in their pockets is $5.40 with a standard deviation of $1.20. A teacher feels that the average amount is ac- tually higher. She surveys 80 randomly se- lected students and finds the average amount is $5.50. At alpha level of 0.05, do students have more change their pockets now than before the teacher took the sur- vey? What does t-test equal to? Two decimal
