Hypothesis Testing Help!

#1
If anyone could help me out with this, I'd appreciate it.

Looking at the increase in nicotine levels from 1998(1.72mg) to 2004(1.89mg) here. One question left to answer.

"Take the 1998 average as your base level. Then perform the appropriate hypothesis test if the nicotine level has increased since 1998. Assume the data is normally distributed. Show your steps. Then, compute the p-value for this test."

I'd appreciate any help I can get.
 
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#2
Hi,
If your value for 2004 is a mean then this is just a one sided test of a mean with a null hypothesis of mu=1.72. The size of the sample and whether the population variance is known will determine whether you use a z or a t test.