general tables and graph questions - year 1 uni bio (Aug/22/2007 )

i have some questions which i have attempted but i need reassurance if they are correct:
1.
For the results described below, select the most appropriate way to present them from the list.
Haemoglobin levels (mg Haemoglobin/mL blood) in 15 different patients with different iron consumption (mg Fe/ kg/ day).

a. text

b. bar graph

c. summary table

d. line (or scatter) graph

e. table


2.
For the results described below, select the most appropriate way to present them from the list.
Haemoglobin levels (mg Haemoglobin/mL blood) in 20 different patients with different diets and lifestyles (eg vegetarian, sedentary).

a. bar graph

b. text

c. table

d. summary table

e. line (or scatter) graph

3.
For the results described below, select the most appropriate way to present them from the list.
The activity of two different enzymes measured using a similar assay.

a. line (or scatter) graph

b. bar graph

c. summary table

d. table

e. text


my answers are in bold out of the multiple choice but i need help to see if they are correct

hmmmm how to show your data is always a good question. often it's good to try it more than one way and see which summarizes your findings in the clearest way possible

1. I would do a line graph first to look for a relationship between hemoglobin and iron (one axis, fe level - other axis, hemoglobin level). if there's no relationship, then maybe a summary - but look for the relationship first

2. summary table - text is always the last choice. it's hardest to get a clear grasp of the data; your goal is to get as much information across in the easiest way possible

3. I personally think you'd use a bar graph here. I'd put the assay name as the x-axis label and have a bar for each enzyme. you could use a line graph, but I think it would be tougher to get a quick, good visual comparison

this is just my opinion.

i also have this other question which is killing me and no one knows the right answer funnily enough, possibly u might be able to help:

1.The following data was collected in an experiment investigating the activity of a protease, trypsin. The activity of trypsin in breaking down a small polypeptide chain was monitored by determining the concentration of the polypeptide in solution (in Molar units) over time. The results are shown below. Graph these results and determine the rate of reaction. Select the option below that is closest to your answer (within 20%).
Time (mins) Polypeptide concentration (mM)
0 =100
1 = 99.5
2 = 99.5
5 =98
10 =97
15 =94


a. 0.7 mM/min

b. 1.1 mM/min

c. 2.4 mM/min

d. 4.1 mM/min

e. 7.1 mM/min

f. 12.0 mM/min

g. None of these values is close to my answer.

it would be easier if i had a graph to look at but if it goes from 100 to 99.5 in one minute and stays steady(ish) after that i would say 0.7

dom