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A marketing manager wishes to compare the mean prices charged for 2 brands of CD players. The manager conducts surveys for random sample prices with these results:

Onkyo Jvc
sample mean, x $189 $145
samp stand dev, s 12 10
sample size 6 12

Use an appropriate hypothese test to provide evidence supporting that the Onkyo is more than $30 higher in price than the Jvc. set alpha = .05.

The first two parts of the question I could figure out, but this one I can't figure out what the appropriate formula/formulas to use.

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