WorksheetsY8 Stats - Population Sampling
Total questions: 11
Worksheet time: 6mins
In statistics, the 'population' means
The entire category (all people or all birds or whatever your studying)
A representative sample from a category
A census is a process of collecting data from
a sample of a population
every member of a population
A poll is a survey given to
The entire population
A sample of the population
'Bias' means
a preference or a belief that is not supported by evidence
When you cut a fabric diagonal across it's weave
In statistics, a sampling bias is when
the sample is a good representation of the population
the sample does not truly reflect the population because the sample was selected in a wa that was unfair or biased
State which of the following survey methods will result in a biased sample:
You want to know the favourite sport of a city so you ask people at an AFL football match
You want to do a survey of the use of parks in your city, so a survey form is sent to all home and business owners in the city.
Sampling bias is often due to inappropriate methods of sampling such as judgemental sampling where a sample of people is selected because of their special knowledge. Which of the following is an example of judgemental sampling:
Students arriving at school through a particular gate between 8 and 8:15 am are asked if they like reading
All of the members of a quilting group are asked what brand of sewing machine they prefer
Convenience sampling is asking people who are easy to find. This is likely to be unreliable and biased. Another common way of finding information quick is to ask people to phone in, or to ask questions from a website. This is likely to be unreliable and biased because it is 'self-selecting', only those motivated to respond will be included. Which of the following is an example of convenience sampling?
A random sample fo mechanics in Australia are asked which brand they recommend
You want to find out he health issues in your community, so you question people who come into the local medical clinic
The best way to collect unbiased data is to use random sampling. This is where each member of the population has an equally likely chance of being chosen in the sample. Which of the following is an example fo random sampling?
Asking people as they enter the supermarket which is their favourite supermarket
Picking names out of a hat
Measuring the height of students from one class of year 7s to find the average height of high school students at a particular school
A casino wanted to run a number of trials to see if the die being used on the Blackjack table was biased. Which of the following would be necessary to make this judgement?
a large number of trials are run
a small number of trials are run
a specific number of trials are run, depending on the time of day
A die is rolled 60 time and the result for each outcome is recorded. This experiment is repeated so that five sets of results are collected (as shown). Which die do you think is fair?
Set 1
Set 2
Set 3
Set 4
Set 5
