00:01
Question here gives us that we have 25 samples of 100, so our n is equal to 25 times 100, which is going to be 2 ,500 here.
00:10
And it says that, though, we're inspected when a process was considered to be operating class factory, really.
00:16
In the 25 samples, a total of 135 items were defective here.
00:24
So it wants us to first of all calculate the proportion of defective devices when the process and control.
00:32
So to take this, we can calculate the proportion by taking the sum of defective devices, so depth divided by the total number of samples here.
00:43
So in this case, it's going to be 135 over 2 ,500, through which if we put this in our calculator, we're going to get approximately 0 .054 here as our answer.
00:54
For part b here, it asks us what standard error or proportion would be given if the sample size of 100 was used for the actual control here.
01:05
So to calculate the standard error, we have to take the standard deviation here.
01:13
So s .e is equal to standard deviation over the square root of our sample size here...