00:01
For this question, let me take note of what's given here.
00:03
The confidence level, which was given as 80%, so we can write as 0 .80.
00:08
So the proportion also given here, which is 0 .5 here.
00:12
And the sample size, so the sample size was given 30 here.
00:15
So we have to find the upper confidence limit, which is, we have to find the confidence interval for proportion.
00:22
First of all, remember the formula, which is, so this is p plus, which is the z alpha over 2 times, this is the square root of p times 1 minus p and divided by n here.
00:35
This is plus or minus for the upper limit.
00:37
I'm going to use the p value, i mean the plus value here.
00:41
First of all, let's get the alpha value, which is 1 minus confidence level.
00:45
So the alpha over 2 would be, which is equal to 1 minus 0 .80 divided by 2...
