00:01
Hi, i'm david and i'm here to help you answer your question.
00:03
Now let me bring up your question here.
00:06
In the question here, we are going to discuss about the competence interval for the mean.
00:12
Let me remind you that the competent interval for the mu, it will be the x bar plus and minus, the t and minus 1 degree freedom and 4 over 2, term 1 ,000, divided square, n.
00:25
In the question we're given the sample size n equal to the 36, the x bar equals to the 230 and the s equal to the 12.
00:36
And the question asks you find the 95 % confidence interval.
00:40
Look at the formula we have given the x by the s and the n.
00:43
The only quantity we need to find will be the t and minus 1 degree with them and 4 over 2.
00:50
Now n equals to the 36 minus 1 will be the 35 and the 95 % confidence and 5 % the 1 by 2 equal to the 2 .5%, which is equal to the 0 .025.
01:03
Now to find this value, i use online calculator with the 35 degree freedom and under level 0 .0 .0 .25...