Population and Sample
We survey all Grade 5 students in the school about their favourite sport.
What is the population?
A student surveys students' favourite type of music.
Is this qualitative?
The number of pets your neighbour has.
Is this discrete data?
Data you collect yourself by surveying classmates.
What is primary data?
Mean of 4, 6, 8, 2.
What is 5?
We asked only 30 students from Grade 5 about how many books they read.
What is the sample?
Number of hours you sleep.
Is this quantitative?
The height of students in Ms Liederman's class.
Is this continuous data?
Data you get from a book, website, or report created by others
What is secondary data?
Median of 7, 5, 9.
What is 7?
We asked every student in our class about their favourite fruit.
Is this a sample?
A survey asks: “How many minutes do you read each night?” This produces this type of data.
What is quantitative data?
Data you measure on a scale, like height or time.
What is continuous data?
Reading last year’s attendance report is this type of data use.
What is secondary data?
Mode of 3, 1, 3, 5, 4.
What is 3?
We sometimes use a sample instead of the whole population.
Is it because it is quicker and more efficient?
“Describe the texture of your favourite snack.” This question collects this type of data.
What is qualitative data?
“Goals scored in a game” is this kind of data.
What is discrete data?
Asking every student in your class about recess games is this type of data.
What is primary data?
Median of 2, 10, 8, 6, 4.
What is 6?
“We asked 30 out of 120 Grade 5 students.” This describes this group.
What is a sample?
A question that leads to numerical answers, such as “How many books did you read?”
What is quantitative data?
A stopwatch timing a race produces this kind of data.
What is continuous data?
The main difference: who collected the data first.
What is the difference between collecting it yourself (primary) and using others’ data (secondary)?
The best measure for 1, 100, 2, 3, 2 (because of the outlier).
What is median?