Answers
From the given data, values for d = Pre exercise - Post exercise are obtained as follows:
- 28, - 30, - 8, - 54, - 48,- 20, - 17, - 80
From the d values, the following statistics are calculated:
n = 8
= - 285/8 = - 35.625
sd = 23.6156
SE = sd/
=23.6156/
= 8.3494
Test statistic is:
t = - 35.625/8.3494 = - 4.2668
Take 
= 0.05
ndf = 8 - 1 = 7
From Table, critical values of t = 
2.3646
Since calculated value of t = - 4.2668 isless than critical value of t = - 2.3646, the difference is significant. Reject null hypothesis.
Conclusion:
The data support the claim that there is a difference in pre - exercise and post - exercise pulse rates.
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