Question: 3c using an appropriate statistical test determine if on average...
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3c) Using an appropriate statistical test, determine if, on average, there is a difference in initial systolic blood pressure (BPXSYes) between those people reducing fat in their diet and those who aren’t (BPXSno). In performing the test, include:

State appropriate hypotheses (define any symbols used).

Using an appropriate formula and showing all working, calculate a suitable test
statistic. You can use SPSS to calculate the means and standard deviations but
the test statistic should be calculated by hand.

Without using SPSS, calculate the Pvalue of this test (clearly define the degrees
of freedom used in calculating this value). 
Interpret the P value and write a meaningful conclusion to answer the above
question.
BPXSYes MEAN  128
BPXSYes STD DEV  21.1801
BPXSno MEAN  120
BPXSno STD DEV  16.527
SAMPLE SIZE  200