You are interested to know the mean lifespan of smart-phone battery. A sample of 105 batteries was taken and a 90% confidence interval was computed. However, you found out that data contained one...

You are interested to know the mean lifespan of smart-phone battery. A sample of 105 batteries was taken and a 90% confidence interval was computed. However, you found out that data contained one extremely low value (outlier). Which of the following will be true if you remove the outlier and recomputed the interval?

I. The interval will be narrower.

II. The center of the interval will decrease.

III. The margin of error will decrease.