OneSample T Minutes for a phone call Test of 18 vs 18 Varia

One-Sample T: Minutes for a phone call
Test of = 18 vs 18

Variable N Mean StDev SE Mean 95% CI T P

Minutes for a phone call 20 15.10 4.83 1.08 (12.84, 17.36) -2.68 0.015

What would your decison be and why?

My decision will be that the mean is different of 18

you can see in the CI at 95%

the confidence interval say that the mean is between 12.84 and 17.36

in this interval is not include the number 18 for this sample

so we can say that at 95% confidence there is such evidence to say that the mean is different from 18