How do I answer these homework questions??

I'm so lost and confused on my hypotheses homework questions?? Any help would be great!! Thanks...


13. At Kellogs Cereal Company the quality control manager claims that cartons filled by the newest machine have more cereal in them than cartons filled by the oldest machine. Samples taken from each machine, which operates independent of each other, yielded the following results:

Machine 1 Machine 2
Sample size 25 36
Sample mean 31.8 oz 30.9 oz
Sample stdev 2.2 oz 1.98 oz

At the 0.5% level of significance, test the claim that the population mean for the newest machine (machine #1) is larger than the population mean for the oldest machine (machine 2).

14. Based on the sample data (data are in inches) below, what can you conclude about the heights of men and women? Do the sample data suggest that men and women have the same mean height? Do the results agree with your knowledge of the heights of men and women? Assume a 0.05 significance level.

Men 73.0 71.6 68.7 65.9 76.4
Women 63.9 67.1 63.2 64.7 70.4