00:01
Hi, i'm david and i'm here to have this is your question.
00:03
Now let me pick up the question here.
00:06
In this question here, we are going to discuss about the hypothesis testing.
00:11
Here we have the null hypothesis when the proportion equal to the zepon 3 versus the ontolateral hypothesis, the proportion not equal to the zabon 3.
00:21
We have a symbol under 400 and we are given the bhart equal to the zambon 5.
00:29
The question asks you find the test statistics.
00:32
Now the test statistic denoted by the z, the formula will be the p -par minus p over square root of the p times 1 minus p over the n.
00:42
So we have the 0 .25 minus p equal to the 0 .3, divided by the square root of the 0 .3, 1 minus 0 .3 over the n will be the 400.
00:56
So if we compute this one we get 73 times 0 .7, we're running by the 400, taking the square root, then 0 .2, 75 minus 0 .3, and equal to minus 1 .0 .09.
01:16
I need to round the 2 decimal places.
01:18
So therefore the answer for the a ruby in the 0 .09...