00:01
So here we are defining p hat as 0 .5.
00:04
And so we have no idea about the pin in this case.
00:07
So we take p is equal to 0 .5, where we're given that e is equal to 0 .03 p hat, which is equal to 1 subtract p hat, which is equal to 0 .5, where c is equal to 90%.
00:20
And so as a decimal, c is equal to 0 .90.
00:23
And so at 90 % confidence level, the z is as follows, where alpha is equal to 1, subtract 0 .90, which is equal to 0 .1 alpha divided by 2, which is equal to 0 .1 divided by 2, which is equal to 0 .05.
00:42
And so using the z table, what we get is z alpha divided by 2 is equal to 1 .645, where the sample size for estimating the proportion is given by n is equal to z squared alpha over 2p, multiplied by one takeaway p, all divided by e2...
