00:01
So our proportion who were considered, that imitated, and that were considered reliable, there were 18 out of 30 babies that did 18 out of 30 to grab.
00:12
And for the proportion for them being unreliable was a 10 out of 30 proportion that imitated.
00:22
So a third of the babies imitated someone that was deemed unreliable, and 18 out of 30, if deemed reliable.
00:28
And that pool value for our test is going to end up being 28 out of 60.
00:35
And so we will be assuming that these two proportions are equal or that their difference is equal to 0.
00:45
And alternately, that the proportion of reliable is going to be higher than the proportion of unreliable, meaning that the proportion for r minus u is going to be higher than the proportion of unreliable, something that is positive.
01:02
So we know that we have at least 10 successes.
01:05
We were close here and 10 failures so we can use our z value and our test statistic is to take the difference in these two proportions.
01:15
So we have the 18 out of 30 minus the 10 out of 30 and then you're subtracting away what we're assuming the difference is which is zero.
01:25
And then we need our full p which is 28 out of 60...