20-15=5
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The width of the confidence interval increases.
class interval GWAPO SI CONRADO CALZADO
Oh, dude, class intervals are the ranges that group data together in a frequency distribution, like 1-10, 11-20, etc. Class width is just the difference between the upper and lower boundaries of each class interval. So, basically, class intervals are like the neighborhoods where data hangs out, and class width is just the size of the houses in those neighborhoods.
The width reduces.
Increase your percent confidence to provide an increased width.