00:01
Confidence level was given in this question, that was given as 0 .95, and the sample mean 12 .7, sample standard division 2, and the sample size 9.
00:10
So we have to calculate the confidence interval for the population mean.
00:15
Remember the formula, the sample mean, plus or minus, because we know the sample standard division, use the t -distribution, sample standard division, divide by root n.
00:23
So the alpha is 1 minus confidence level, we need alpha over 2, 1 minus 0 .95, and divide by 2, which would be 0 .025.
00:32
I need the degrees of freedom, and minus 1 here, which is 9 minus 1, that would be 8...