Or search by topic
Published 2018 Revised 2019
Why might they have wanted to ask me demographic questions?
I am given a small area to work on. I am given a list of all of the addresses in the area, which is typically about 250-400 addresses. I then go round them, knocking on every door that I can, until I find enough people willing to answer the survey. Many homes I come to are empty, and even when I find people in, they usually refuse to take part. My target is 12 interviews in two days. Sometimes I knock on doors for over two hours without anyone agreeing to take part, while other times, I have a whole string of interviews with very few refusals.
It turned out that I visited every address in the list that I could yesterday, but most of them were in a big tower block that I couldn't get into. So I had run out of addresses without doing enough interviews. My supervisor gave me permission to go to the roads just outside the specified area to knock on more doors. And that's how I ended up at your house.
I also have targets related to the type of interviewee. For example, yesterday and today, one of my targets is to interview at least 6 males but at most 6 females. Another target is related to the age groups that people are in. I will only interview one person in a house, so if I am meant to be interviewing lots of young people for some particular survey, I might ask the person who answers the door if there is someone younger in the house whom I could interview instead.
What issues might be caused with this method of sampling?
How could the company deal with these difficulties?
Pranav read out most of the questions from his small laptop computer, and typed in my answers. He was happy for me to look at the screen most of the time, but for some questions, such as "What is the most important issue facing Britain today?", he was instructed to make sure I couldn't see the screen before the question appeared.
Why might I not have been allowed to see the screen for a question like this?
There was also a series of questions about my weight, which were roughly like this:
This pilot collection of resources is designed to introduce key statistical ideas and help students to deepen their understanding.
Where do people fly to from London? What is good and bad about these representations?
How was the data for this problem compiled? A guided tour through the process.