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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

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
tijani
what is titration
John Reply
what is physics
Siyaka Reply
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Jude Reply
Can you compute that for me. Ty
Jude
what is the dimension formula of energy?
David Reply
what is viscosity?
David
what is inorganic
emma Reply
what is chemistry
Youesf Reply
what is inorganic
emma
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
Krampah Reply
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
Sahid Reply
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
Ryan
what's motion
Maurice Reply
what are the types of wave
Maurice
answer
Magreth
progressive wave
Magreth
hello friend how are you
Muhammad Reply
fine, how about you?
Mohammed
hi
Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
yasuo Reply
Who can show me the full solution in this problem?
Reofrir Reply
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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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