You are assessing the difference in the average time that two new fully-charged solar batteries can produce electricity before they need to be again exposed to the sun. Using a sample of 50 Type 1 batteries and 50 Type 2 batteries, you build a 90% confidence interval estimate of the difference in average operating times for the two batteries and the interval turns out to be 16 plus or minus 3 hours. How should you interpret the interval?
A. We can be 90% confident that the interval 13 to 19 hours will contain the difference in average operating time for the two samples.
B. We can be 90% confident that the difference in average operating time for the two populations represented here will be 3 hours.
C. We can be 90% confident that the interval 16 plus or minus 3 hours will contain the difference in average operating time for the two populations represented here.
D. 90% of the operating times will be between 13 and 19 hours.