nothing! the only thing is that the ultra chi comes in various colors and the chi is in black. also, the regular chi is the first one to come out so its less advanced than the ultra and the ultra comes with tourmaline plates which is less damaging to your hair aswell.
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t test is used when- a) variables are studied b)the size of sample is a small one.(n<30) chi square test is studied when a) attributes are studied
yes it is
They are applicable in different circumstances.
difference between as on and as at
No.