00:01
Here in this question there is given the sample mean.
00:05
So the sample mean, which is denoted by x bar, which is 14 .7.
00:12
And the standard deviation, which is denoted by s, that is given as 4 .9.
00:20
And the number of item, the sample size, is given as 30.
00:24
And the confidence level, which is given as 95%, which is 0 .95 here.
00:32
What we have to do.
00:33
First of all, let's say part a, we have to just find the margin of error here.
00:39
So what is the formula for margin of error? so first of all, in the question it says we have to use the t distribution here.
00:47
The margin of error here, which is this is t alpha over two times standard division divided by square of the sample size.
00:57
First of all, let's get the alpha...