Construct and compare a range of data displays including stem-and-leaf plots and dot plots (VCMSP269)
LO: To construct a data display.
How to create quality survey questions.
How to collect data and visually represent the information collected.
How to tally the results.
That data can be visually represented to paint a picture of the bigger story.
I can construct a data display to visually represent the data collected.
How to do a Survey
Surveys helps us to collect information, so that people can make decisions based on a topic of interest.
Eg.) Stores might survey their customers to find out what their favourite type of stock is, so that they can order more or a school might survey their students to find out what their favourite subject in school is.
The best part of the surveys is that they’re easy to set up and can answer essentially any question at hand.
4 Steps to Conducting a Survey
1) Create a question.
2) Ask the question to your target audience
3) Collect and tally your results
4) Present the results so that they’re easy to read.
Types of Surveys
Remember there are different types of surveys that you can do.
Eg.) If you surveyed an entire class, “What is your favourite colour?”, it would be a census categorical (qualitative) survey. Census because it is the whole class and categorical because it deals with categories.
If you surveyed 10 people in a class about, “How many people are in their family?”, it would be a sample numerical (quantitative) survey. Sample because it is only 10 people out of a whole class and numerical because it deals with numbers for answers.
1) Create a question
Eg.) What is your favourite colour?
2) Ask your audience
Remember what type of survey you want, if you don’t have the time to survey the entire population, then you need to do a sample survey.
Sample surveys might not be the complete representation of your audience. If you had a question, of “What is the average height of Alamanda students?” but you only collected data from prep students, that wouldn’t be an accurate sample for your survey.
A good method is to choose randomly, Eg.) Every 10th person you see, male then female then male then female.
Remember the more people you ask, the more accurate your results will be, but sometimes you don’t have time to survey a lot of people. According to research, if you randomly surveyed 2000 people, you can be as close to 1% to the actual results of surveying everyone in the world.
3) Collect and tally your results, a simple way is to use a tally table.
There is a flaw in this tally because there is no “other” option. Remember a survey has to have all of the options that someone might consider. There is no option for someone who doesn’t like yellow, red, blue, green or pink in this case.
4) Presenting the results
Remember sometimes data is very hard to read, so ti make it easier for your audience, you want to “sum up” the information so that it’s easy to read for them.
Tables are easy to read and sums up information very quickly.
Graphs are another visual to sum up information for the audience.
Statements or Generalisations
Statements or generalisations are another way of summarising information.
Blue was the most popular colour with 6 people selecting it.
Green was the least favourite colour with only 1 person selecting it.
These simple statements help to direct people towards the key findings of the survey.