00:01
Hi, i'm david and i'm here to help me answer your question.
00:04
Now let me bring up your question here.
00:06
In the question here, we are going to discuss about the complex interval for the mean.
00:11
Let me remind you that the competence interval for the mew, it will be the xb plus or minus the z and 4 over 2 times with the sigma divided base quality to the n.
00:23
In the case then the sigma is not given, we can replace the s if we have the n greater equal to the 2.
00:31
In the question here, we have the n equal to the 50, it's greater than 30 already.
00:37
We have given the x -par, it will equal to the mean it will be the 30 .5, and we have the s equal to the 18 .8.
00:50
The question asked you to find the 99 % confident interval.
00:54
Look at the formula, we have given the x -par, the s, and the n.
00:58
The only quantity we need to find, it will be the z unfar over 2.
01:02
And the 99 % confidence is unful to the 1 % divided by 2 % equal to 0 .05%, which is equal to the 0 .0 .05...