00:01
Compile the confidence interval, we have the formula.
00:03
The confidence interval equal to x bar plus minus t multiplied by s over square n, where t is the critical, t critical value that correspond to degree of freedom equal to n minus 1 equal to 15, and for 90 % confidence level, so t equal to 2 .947.
00:29
And we have the t critical value, sorry, this is, so t here 2 .947, and sorry, it's equal to 1 .753.
01:19
So we have confidence interval equal to the mean x bar, and x bar is the mean, and s is the standard deviation, and n is sample size.
01:37
So we have confidence interval equal to 42 .7 plus minus 1 .753 multiplied by 6 over square root 16, and equal to, so the lower limit is 40 .0705, and the upper limit is 45 .3295...