00:01
Hi, i'm david and i'm here to help you answer your question.
00:03
Now let me pick up your question here.
00:06
In the question here, we are going to discuss about the confidence interval for the mean.
00:11
Let me remind you that the confidence interval for the mean, it will be the x -par plus or minus the t and minus 1 degree freedom and 4 over 2 time when the s divided square into the n.
00:25
In the question here, we're given the n equal to the 108, the x -par, the summing equal, to the 98 .2 and the s equal to the 0 .64.
00:38
And the question asked later to find the 99 % confidence interval.
00:43
Look at the formula we are given the x part, the s and the end.
00:46
The only quantity we need to find will be the critical value.
00:49
Tm minus 1 degree, fide, and 4 over 2, and n equals to the 108, minus 1 will be the 107.
00:57
And 599 % confidence equal to the 1 % devalued.
01:01
1b2 equal to the 0 .15%, which is equal to the 0 .005.
01:07
Now to find this value, i need to bring up the t table.
01:11
Let me combine the t table.
01:13
But the t table, it doesn't have the value of the 100.
01:16
So i will use the calculator to compute the critical value...