Hey everyone. Welcome to the activity solutions lecture for the activity of selecting the right control chart for discrete data. Let's look at the first situation. As a quality auditor you are required to audit a certain percentage of transactions each month you identify the defective transactions out of the total transactions audited each month, the total volume of transaction vary. You have collected the data for last 28 days. Create a control chart to identify if the process is in control.

In this situation, you capture defective transactions. This, you know that you're capturing discrete data. The subgroup size varies each month. So you will use the P chart. Now let's look at the second situation. a laptop manufacturer wants to identify defects per unit on the final assembly line.

Sample size is selected as five laptops data on the number of defects in 20 samples of five laptops each is provided in this situation, you are capturing defects per unit and the subgroup size is five, this you will use a C chart. Let's look at the third example. The data gives the number of defective assemblies in sample of size hundred identify if the process is in control. Guys, in this situation you capture the number of defectives and the subgroup sizes construct this, you will use an NP chart. Now, the fourth example, a mobile phone manufacturer uses a control chart to monitor the imperfections in their final product. Production output is inspected for 20 days for a varying subgroup size and the resulting data is provided, create a control chart and identify if the process appears to be in statistical control.

In this situation, the mobile phone manufacturer is capturing the number of defects and the subgroup size is varying this, he can use a huge chart. That brings us to the end of this activity solutions lecture. I hope your answers were the same as the ones that are described out here. Thank you for attending. See you in the next one.