It is a special kind of linear function wear the line on a graph goes straight through the origin.
If x is directly proportional to y, then it means that for a value of x, y = cx, where c is some constant. For example, if a slice of Pizza costs a fixed cost (say 1 dollar), then the cost of your pizza meal is directly proportional to the number of slices you order. (Cost = 1 times number of slices.)
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The confidence interval is not directly related to the mean.
What 5 numbers can have the mean of 24 and the median of 25
It means that the sides of one are directly proportional to the corresponding sides of the other. That all the corresponding angles are equal.
That means that if "x" varies by a certain factor, "y" will vary by the same factor. For example, if "x" is double, then "y" will also double.
Variance isn't directly proportional to standard deviation.