Z-Scores and Pearson Correlation: If we have scores that are expressed as standardized scores -- Z-Scores with a mean of zero and a variance of one -- then the formula for the Pearson Correlation becomes particularly simple.
PNG Formats. .PNG files in logo design and when you should use them. PNG is an acronym for Portable Network Graphics. PNGs are bitmpapped (raster/pixel based) image formats that can be used instead of GIF images or JPGs. PNG logo images are superior to other pixel based formats as they employ a âlosslessâ data compression system.
Portable Network Graphics (PNG) images are implemented in place of GIF files. A PNG graphic is a high-quality graphic image, but it does not take up as much Web host hard drive space as other images such as JPG or BMP.his loads the file in the Paint software. Click the File menu item and then select Save As.. A new window opens where you can convert and change the file extension for the file. Select JPG from the drop-down box labeled Save as type.. In the text box labeled File name, enter a new name for the converted file.