00:01
Now here you look at the statistics reports, right? so the report said in 2011, right, actually it's in 2010, the us cesarean deliver rate was about 32 .8 % rate.
00:15
So i did know that rate by p equals 32 .8%.
00:21
And that, of course, means a standard deviation, which is given by actually square root of p times 1 minus p.
00:32
For a standard balloon distribution, right? so you'll find this to be given by square width of 0 .30 to 8 times 1 minus 0 .30 to 8.
00:48
And that will be giving you actually 0 .4 .7.
00:54
Okay? so that's the standard deviation, which i'm going to call it sigma, right? and then this year, some research took a random sample of 100 births.
01:09
So the sample size is 100 versus.
01:12
And it turns out that 41 % of them has a cesarene.
01:16
So i'm going to call this x bar, which actually going to be the sample proportion that is 41 divided by 100...