Calcalating a confidence interval in excel

I'm not sure if I am posting this in the correct place but...I really need some help..I need to calculate a confidence interval in excel for this set of data. I am not sure how to do this in excel ?This is for my statistic class and basically we (my teammates) are trying to prove the hypothesis that "Older workers typically make more than younger workers"...So with this data set of 30 samples I have to figure the confidence interval..?? I am so lost in this class and I am terrible with Math...if anybody can please help I would greatly appreciate it...TIA

WageIndustryOccupationEducationExperienceAge$11,18 6.00 0012018$20,852.00 0012119$10,997.00 0414020$13,787.00 0411421$19,452.00 0413322$39,888.00 0312523$20,793.00 0012624$16,789.00 0313625$11,451.00 1012826$29,191.00 0012927$24,509.00 05141535$33,498.00 01102036$29,390.00 00131837$33,411.00 12122038$22,485.00 03122240$83,601.00 05171841$33,389.00 01142242$31,799.00 03122543$66,738.00 0092944$9,879.00 03122846$46,646.00 2054455$32,235.00 03123856$50,171.00 05123957$36,178.00 03124058$15,160.00 0484559$12,285.00 01124260$45,976.00 02124361$18,752.00 04114562$17,626.00 03124563$19,981.00 0445464