STA220H1 Lecture 4: STA220 LEC4

• School: UTSG
• Department: Statistical Sciences
• Course: STA220H1
• Professor: Tounkara, F.

Document Summary

A function that assignsnumeric values to different events in a sample space. Arv for whichfor whichthere exists a discrete set of numeric values (cid:10975) a x numberoftails weget when we flip a coin lo times. A ru whosepossiblevalue cannot be enumerated (cid:10975) x birthweight of the next baby born at a hospital y waiting time at a busstopuntilthenextbus arrives. Massfunctionforadisaten. rr. in ant to look at the probabilities associated with a discretrvcd. pl x the prob that the rv x has the value x. A table that assigns (cid:2241) any possiblevalue x of a discreet. Rv x the probability pix d (cid:2241) be a valid pmf. The prob of any value must be between coand i. Ep x en el ego (cid:26406) the sum of the prob of all values must exactly equal. Ep (cid:1066) n 1 (cid:6492) name arianceofrandomuariables a considerthe sampleof size n x_x n. The samplevariance is definedby 5 (cid:1605) (cid:1251)(cid:3598) (cid:1360)