Heart Rate

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Heart Rate
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Some of the Heart Rate Data
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Some of the Heart Rate Data

• Take a look at the data so you have some ideas to
  start with.
• Get an idea about the type of question you might
  like to answer.

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Possible questions

• Is there a relationship between the number of
  beats/min before and after the students had
  stepped up and down on a block of a fixed height?
• How does the heart rate change after exercising?

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Start with calculating the statistics on Excel.
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Comment on the statistics

• Comment on the Central Tendencies

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Comment on the statistics

• The mean increased by 26.3 beats/min but the
  median increased by 18 beats/min. This suggests
  that there are extreme values and the median
  would be a better measurement an average
  increase.
• The mode has little meaning in this context.

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Comment on the statistics

• Now comment on the spread.

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Comment on the statistics

• The range of values for the final increased by 42
  (probably due to extreme values).
• The IQR would give a better measure of spread as
  the increase was only 12.

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Appropriate graphs

• If we are comparing values, a box and whisker
  plot would show this.

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Comments

• These plots show that there has been a marked
  increase in heart rate after the exercise.
• All three measures Median, LQ and UQ have
  increased.
• As the boxes do not overlap, the increase can be
  considered to be significant.

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Comments

• Both the range and interquartile range have
  increased showing an increase in the spread of
  the data.

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If you are looking for a relationship between
variables a scatterplot shows the relationship.
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If you are looking for a relationship between
variables a scatterplot shows the relationship.

• The relationship between resting and final heart
  rate is a positive linear relationship.
• The gradient of the line suggests that we could
  expect on average a 1.12 beats/min increase in
  heart rate for every 1 beat/min increase in the
  resting heart rate.

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Evaluation

• 30 volunteers were found from among the students
  friends.
• Because the survey was done using volunteers, it
  may not represent the population as a whole.
• The students friends may be more or less
  physically able than the general student
  population.