What kind of test is this?

esuits confirm the gardener's expectations? [ Choose ] 2 sample t test 1 sample t test Tutors are expected to keep track of their Paired t test holiday bonuses and report it on their 1 proportion z test income tax forms. "John" the tutor is 2 proportion z test suspected to have been under reporting his income (he says he averaged $8.73 on bonuses), so they are auditing his tax return. An IRS agent goes through his bank statements and obtains a random sample of 80 entries. The average bonus size shown was $9.68 with a standard deviation of $2.72. Does the IRS have a case against him