## 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

s_{d} = 23.6156

SE = s_{d}/

=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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