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Inleiding

In die wêreld rondom ons word inligting dikwels in die vorm van syfers, grafieke en tabelle gegee. Ons sien dit op die televisie, op die radio en in die koerante. Ons word blootgestel aan misdaadsyfers, sportuitslae, reënval, die uitgawes van die regering, die tempo van HIV/VIGS infeksie, bevolkingsgroei en ekonomiese groei.

Hierdie hoofstuk demonstreer hoe Wiskunde gebruik kan word om data te manipuleer, om data en tendense voor te stel of wan voor te stel en om oplossings te bied wat direk betrekking het op die wêreld rondom ons.

Vaardighede wat in vorige grade verwerf is en verband hou met die versameling, organisering, uitbeelding, analise en interpretasie van inligting, word hier verder ontwikkel.

Hersiening van vorige werk

Dataversameling is in vorige grade bekendgestel as 'n manier om antwoorde te kry vir vrae wat te make het met die wêreld rondom ons.

Data en datainsameling

Data

Data

Data verwys na inligting wat waargeneem of opgeneem is as deel van 'n eksperiment of 'n meningspeiling. Daar is twee tipes data: primêre en sekondêre data. Die woord "data" is die meervoud van die woord "datum".

Data kan geklassifiseer word as primêr of sekondêr , en primêre en sekondêre data kan verder geklassifiseer word as kwalitatief of kwantitatief . [link] som die klassifikasie van data op.

Klassifikasie van data
  • beskryf die oorspronklike data wat versamel is. Hierdie tipe data staan ook bekend as rou data. Dikwels is die primêre datastel baie groot en moet dit opgesom of verwerk word om betekenisvolle inligting uit te lig.
  • is inligting wat nie met getalle beskryf kan word nie, byvoorbeeld as jy data insamel oor hoe mense voel of wat hul gunstelingkleur is.
  • is inligting wat geskryf kan word as getalle, byvoorbeeld as jy data insamel oor mense se lengte of massa.
  • is primêre data wat opgesom of verwerk is. Die stel kleure wat mense as hul gunstelingkleure aangedui het, is 'n voorbeeld van sekondêre data omdat dit 'n opsomming is van mense se antwoorde.

Die proses om primêre data om te skakel na sekondêre data deur analise, groepering of organisering is die proses waardeur informasie geskep word.

Doelwit van die insameling van primêre data

Data word versamel om antwoorde te kry wat help om 'n sekere situasie beter te verstaan. Hier is 'n paar voorbeelde van dataversameling uit die regte wêreld wat kwalitatiewe en kwantitatiewe data illustreer.

Kwalitatiewe data

  • Die plaaslike regering sal wil weet hoeveel inwoners elektrisiteit het en mag dan aan hulle vra: "Het jou huis 'n veilige, ononderbroke toevoer van elektrisiteit vanaf die nasionale kragvoorsiener (Eskom)?"
  • 'n Maatskappy wat medisyne vervaardig mag vra: "Hoe effektief verlig ons pil hoofpyn?" Daar kan dan aan mense wat die pil gebruik om hoofpyn te verlig, gevra word: "Hoe baie help ons pil om jou hoofpyn weg te neem?" Die maatskappy kan dan op grond van mense se antwoorde bepaal hoe effektief hul produk is.
  • 'n Motormaatskappy wil hulle kliëntediens verbeter en kan dan aan kliënte vra: "Hoe kan ons ons kliëntediens verbeter?"
  • 'n Supermarkbestuurder mag vra: "Watter tipes gaskoeldrank moet ek in my supermark in voorraad hê?" Daar mag dan miskien aan klante gevra word: "Wat is jou gunsteling gaskoeldrank?" Die klante se keuse of voorkeur is 'n voorbeeld van kwalitatiewe data.

Questions & Answers

what does the ideal gas law states
Joy Reply
Three charges q_{1}=+3\mu C, q_{2}=+6\mu C and q_{3}=+8\mu C are located at (2,0)m (0,0)m and (0,3) coordinates respectively. Find the magnitude and direction acted upon q_{2} by the two other charges.Draw the correct graphical illustration of the problem above showing the direction of all forces.
Kate Reply
To solve this problem, we need to first find the net force acting on charge q_{2}. The magnitude of the force exerted by q_{1} on q_{2} is given by F=\frac{kq_{1}q_{2}}{r^{2}} where k is the Coulomb constant, q_{1} and q_{2} are the charges of the particles, and r is the distance between them.
Muhammed
What is the direction and net electric force on q_{1}= 5µC located at (0,4)r due to charges q_{2}=7mu located at (0,0)m and q_{3}=3\mu C located at (4,0)m?
Kate Reply
what is the change in momentum of a body?
Eunice Reply
what is a capacitor?
Raymond Reply
Capacitor is a separation of opposite charges using an insulator of very small dimension between them. Capacitor is used for allowing an AC (alternating current) to pass while a DC (direct current) is blocked.
Gautam
A motor travelling at 72km/m on sighting a stop sign applying the breaks such that under constant deaccelerate in the meters of 50 metres what is the magnitude of the accelerate
Maria Reply
please solve
Sharon
8m/s²
Aishat
What is Thermodynamics
Muordit
velocity can be 72 km/h in question. 72 km/h=20 m/s, v^2=2.a.x , 20^2=2.a.50, a=4 m/s^2.
Mehmet
A boat travels due east at a speed of 40meter per seconds across a river flowing due south at 30meter per seconds. what is the resultant speed of the boat
Saheed Reply
50 m/s due south east
Someone
which has a higher temperature, 1cup of boiling water or 1teapot of boiling water which can transfer more heat 1cup of boiling water or 1 teapot of boiling water explain your . answer
Ramon Reply
I believe temperature being an intensive property does not change for any amount of boiling water whereas heat being an extensive property changes with amount/size of the system.
Someone
Scratch that
Someone
temperature for any amount of water to boil at ntp is 100⁰C (it is a state function and and intensive property) and it depends both will give same amount of heat because the surface available for heat transfer is greater in case of the kettle as well as the heat stored in it but if you talk.....
Someone
about the amount of heat stored in the system then in that case since the mass of water in the kettle is greater so more energy is required to raise the temperature b/c more molecules of water are present in the kettle
Someone
definitely of physics
Haryormhidey Reply
how many start and codon
Esrael Reply
what is field
Felix Reply
physics, biology and chemistry this is my Field
ALIYU
field is a region of space under the influence of some physical properties
Collete
what is ogarnic chemistry
WISDOM Reply
determine the slope giving that 3y+ 2x-14=0
WISDOM
Another formula for Acceleration
Belty Reply
a=v/t. a=f/m a
IHUMA
innocent
Adah
pratica A on solution of hydro chloric acid,B is a solution containing 0.5000 mole ofsodium chlorid per dm³,put A in the burret and titrate 20.00 or 25.00cm³ portion of B using melting orange as the indicator. record the deside of your burret tabulate the burret reading and calculate the average volume of acid used?
Nassze Reply
how do lnternal energy measures
Esrael
Two bodies attract each other electrically. Do they both have to be charged? Answer the same question if the bodies repel one another.
JALLAH Reply
No. According to Isac Newtons law. this two bodies maybe you and the wall beside you. Attracting depends on the mass och each body and distance between them.
Dlovan
Are you really asking if two bodies have to be charged to be influenced by Coulombs Law?
Robert
like charges repel while unlike charges atttact
Raymond
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Source:  OpenStax, Siyavula textbooks: wiskunde (graad 10) [caps]. OpenStax CNX. Aug 04, 2011 Download for free at http://cnx.org/content/col11328/1.4
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