I used the online analysis tool to calculate means of usual hours worked by occupation in one small state (Oregon), using 2016 five-year ACS. The output shows shades of blue and red, with some cells uncolored. The legend shows corresponding Z statistics.
I have two questions:
What does uncolored mean? The legend shows light blue as <0 and light red as >0. But the blank cells don’t seem to be EXACTLY zero, which would be a value that equals the sample mean.
How can I describe red and blue shades in terms of statistical significance? As I understand it, you’d want a Z-stat of +/-1.65 to be 90 percent confident the mean of one cell is different from the overall sample mean. In the online output, very light blue corresponds to a Z-stat between 0 and .5, or less than half of one standard deviation. But it’s tempting for me to attach SOME meaning to this result, based on your use of a color vs. no color.
Thank you in advance.