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 this question here, we'll discuss about the common interval for the mean.
00:10
Let me remind you that the common interval for the meal, it will be the x -par plus or minus the tm minus 1 degree freedom and 4 over 2, 10 with the s, the vulnerable square, n.
00:23
In this question here, we've given the common interval will be 80%, which is the c here, the x -par, equal to the 105, the s equal to the 10, the n equal to nine.
00:37
So we see that so far we have given the x bar s n.
00:42
So the quantity we need to find it will be the t m minus 1 and far over 2.
00:47
Now from here we see that the t will equal to m equal to 9 so the 9 minus 1 will be 8 and far it will equal to the 100 % minus 1.
01:00
80 % will be 20%, the value 2 % will be 10%, so will be the 0 .1.
01:06
Now if we bring up the t table, we should be able to find the critical value.
01:11
So let me copy the table here and let me put the table down here for you...