Question

to check the dependence between veriables we use​

Answer 1

The most familiar measure of dependence between two quantities is the Pearson product-moment correlation coefficient (PPMCC), or "Pearson's correlation coefficient", commonly called simply "the correlation coefficient". Mathematically, it is defined as the quality of least squares fitting to the original data.

$\large\green{\fbox{Shraddha❤}}$

Answer 2

ᴘʜᴏᴛᴏꜱʏɴᴛʜᴇꜱɪꜱ ɪꜱ ᴀ ᴘʀᴏᴄᴇꜱꜱ ᴜꜱᴇᴅ ʙʏ ᴘʟᴀɴᴛꜱ ᴀɴᴅ ᴏᴛʜᴇʀ ᴏʀɢᴀɴɪꜱᴍꜱ ᴛᴏ ᴄᴏɴᴠᴇʀᴛ ʟɪɢʜᴛ ᴇɴᴇʀɢʏ ɪɴᴛᴏ ᴄʜᴇᴍɪᴄᴀʟ ᴇɴᴇʀɢʏ ᴛʜᴀᴛ, ᴛʜʀᴏᴜɢʜ ᴄᴇʟʟᴜʟᴀʀ ʀᴇꜱᴘɪʀᴀᴛɪᴏɴ, ᴄᴀɴ ʟᴀᴛᴇʀ ʙᴇ ʀᴇʟᴇᴀꜱᴇᴅ ᴛᴏ ꜰᴜᴇʟ ᴛʜᴇ ᴏʀɢᴀɴɪꜱᴍ'ꜱ ᴍᴇᴛᴀʙᴏʟɪᴄ ᴀᴄᴛɪᴠɪᴛɪᴇꜱ.