 Lucy and in this video we're going to look at the different types of data that exist and how it can be classified. Starting with data collection. If data is collected by or for the company that is going to use it, it's called primary data. If the data comes from somewhere else, it's secondary data. Secondary data can have many benefits like saving time and money or providing information on past events. But you must carefully consider the reliability and validity of the source. In fact this is true for all statistics. Whenever I read a statistic that interests me, I always look to see where did the data come from and who funded it. You'll often find that the source has an ulterior motive. Now for types of data. Data can be qualitative or quantitative. Things like gender, favourite colour, religion, opinions, anything that is non-numerical. It's qualitative. It's descriptive information whereas numerical things. So things that can be quantified or counted. They're quantitative data. Quantitative data can be discrete or continuous. Discrete data can only take certain values like how many siblings you have. You can't have 2.63 siblings. Whereas continuous data can take any value. It can be measured like your heights. You don't have to be either 174 centimetres or 175 centimetres. You can be somewhere in between. Our final thing to discover is what is the difference between univariate and bivariate data. The prefix uni means one. Like a unicorn with one horn and a unicycle with one wheel. So univariate data is data with one variable. Like if we weighed these babies. We only have one variable. Their weight. Whereas if we also measured the babies. We now have two variables or two types of data. This is bivariate data. With two variables we can make comparisons. We can do different things with univariate and bivariate data. Which we'll look at in other videos. And you can actually have data with more than two variables. This is then multivariate data. Which we don't really need to worry about at this stage. So here are some questions to test your understanding of data. Pause the video and answer them. How did you get on? There we have different types of data. The question that we're asking determines how we collect our data and how we then analyse it. Watch our other videos to discover how to use the different statistical tools. If you liked the video give it a thumbs up and don't forget to subscribe. Comment below if you have any questions. Why not check out our Fuse School app as well. Until next time.