For the data below, which graph would be the best way to display the results

Graphs can be used in a variety of ways to display data.  Match the graph with the best description of how they can be used.

The Boston Marathon has been run since 1897, when there were 15 runners.  In 2015 it has 30,251 runners and a similar demographic of runners as the Chicago marathon.

Given that, what proportion (percent as a whole number) of runners would be W40-44 in the Boston Marathon? How many runners would this be? (enter this value in the answer box below) 

Fiona has decided to undergo some exercise training to try and get fitter.  She has heard that mitochondria are the power houses of cells, and you can make more of these if you train hard.  Fiona would like to know how many mitochondria she has, but that would mean having a muscle biopsy and not a feasible option.  After some investigations, Fiona learnt that it is also possible to undertake a maximal exercise test on an exercise bike that would provide some measure of her fitness, in units of maximal oxygen consumption or a VO₂ peak test.  She found someone to do this testing and did the first test before beginning any training, at which point her VO₂ peak was 31 ml.kg^-1.min^-1.   She underwent the same test at the end of a 12 week training regime, when her VO₂ peak was 39 ml.kg^-1.min^-1. 

Based on this information, what percent improvement in VO₂ peak did Fiona achieve? (enter value only to one decimal place)

The following two graphs are comprised of the same data from 10 individuals, aged 25 years old, who exercised at low-medium intensity for 30 minutes.  The data are presented in bar graph format (A) and scatter plot format (B, where each individual is shown in the same colour) and show the heart rate (in beats per minute, bpm) at Rest and 10 minute intervals throughout the exercise.  Statistical analyses revealed increased heartrate at 20 min compared with Rest (*) and 10 min (#), at 30 min compared with Rest (*), 10 min (#) and 20 min (^), all p<0.05. 

On average, how does low-medium intensity exercise effect heart rate?

The following two graphs are comprised of the same data from 10 individuals, aged 25 years old, who exercised at low-medium intensity for 30 minutes.  The data are presented in bar graph format (A) and scatter plot format (B, where each individual is shown in the same colour) and show the heart rate (in beats per minute, bpm) at Rest and 10 minute intervals throughout the exercise.  Statistical analyses revealed increased heartrate at 20 min compared with Rest (*) and 10 min (#), at 30 min compared with Rest (*), 10 min (#) and 20 min (^), all p<0.05. 

What can be determined from Figure B that cannot be determined from the data when presented in Figure A?

The following two graphs are comprised of the same data from 10 individuals, aged 25 years old, who exercised at low-medium intensity for 30 minutes.  The data are presented in bar graph format (A) and scatter plot format (B, where each individual is shown in the same colour) and show the heart rate (in beats per minute, bpm) at Rest and 10 minute intervals throughout the exercise.  Statistical analyses revealed increased heartrate at 20 min compared with Rest (*) and 10 min (#), at 30 min compared with Rest (*), 10 min (#) and 20 min (^), all p<0.05. 

The most variability is seen in the data for which time point?

Using a process of elimination and what they cannot be, determine what type of error bars are likely shown on the graph below?

What is missing from the graph below?