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3.3 How many people in a particular province are HIV positive?

3.4 How does the prison population of one province compare with that of another province?

3.5 When one looks at the number of women in our parliament, how does that compare with the situation in other democratic countries?

3.6 What is the distribution of wealth in the world – in other words, what percentage of the world’s population owns, say, half of the world’s wealth?


To learn about using various methods for gathering data

[LO 2.2, 5.2]

In the research about the cell phones and sport, it was easy to get information. But sometimes one has to work a little harder.

1 When one has to count something (for example, the number of lefthanders in the school), the easiest way is to use a tally table

  • Below is a tally table for filling in information about the ages and sex (male or female) of you and your siblings (brothers and sisters). For each sister, you make a little line (a tally) in the “sisters” row under the appropriate age. For each brother you do the same in the “brothers” row. Don’t forget yourself! Every learner in the class must do the same. Every time you have to add a fifth tally, you put it across the four others – this makes it easier to add all the tallies at the end to get the totals for each age. The first tally table shows an imaginary e x ample – you will use the second one for your class.
Ages <1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 >24
Total sisters
Total brothers
  • The numbers in the bottom two rows give the frequency of the occurrence of the different ages. A frequency table shows the frequency distribution of the characteristic being studied.
  • You can see that the tables in the cell phone and sport examples are also frequency tables.

2 Questionnaires are used when the information to be gathered is more complicated than can be entered on a tally table

  • Someone might stop you in a shopping centre and interview you about your toothpaste and flossing habits.
  • The questionnaire form might have questions like:
  • Do you use toothpaste never, once, twice or more than two times a day?
  • Do you buy a new toothbrush every week, every month or every year?
  • Do you floss your teeth regularly or only when you think you have food stuck in your teeth?
  • Do you prefer flavoured toothpaste?
  • Do you like coloured toothpaste?
  • Do you go the dentist regularly or only when necessary?
  • How many fillings have you had?
  • Have you had any teeth extracted?
  • Form small groups and briefly discuss some of the possible reasons why someone might want this information.
  • Many questionnaires are printed in newspapers and magazines. Sometimes they are just for fun, and you can analyse them and read the results right away. But some can be serious, and you might be asked to post them back. Often, to encourage people to participate, a prize or reward might be offered! Many people hate filling in questionnaires, and they have to be persuaded – but for others it is great fun and they don’t mind being helpful.

3 Another way of getting information is to do an experiment.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
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Source:  OpenStax, Mathematics grade 9. OpenStax CNX. Sep 14, 2009 Download for free at http://cnx.org/content/col11056/1.1
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