Qualitative data refers to the qualities of the results. For example saying that the balls are red and bouncy and cool to the touch are qualitative observations.
Quantitative data refers to numeric quantities of the results. If you report that there are three balls, that will bounce to a level of one meter when dropped from a height of two meters, and have a surface temperature of 15o C, you are talking quantitatively.
A good lab report or experiment will usually take both qualitative and quantitative data into account.
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PH is a number, so it is quantitative.
They are methods for analysing statistics in which that data are, respectively, qualitative and quantitative.
qualitative
qualitative
quantitative.