# Past Exam for STAT 100 - ELEM STAT & PROB at Maryland (UMD)

## Exam Information

 Material Type: Final Professor: Staff Class: STAT 100 - ELEM STAT & PROB Subject: Statistics and Probability University: University of Maryland Term: Spring 1996 Keywords: SignificancePeptic UlcersFollowing EventsLevel of SignificanceSynthesizingThe IndependentExplanationAssumptionsProbabilitiesCalculators

## Sample Document Text

,/ STAT 100, Spring 1996 Alternate Final Exatn Ma.y 16, 1996 Directions: Work each problem, showine all steps in your solution. You may use (;alculators. Do not spend too much time on anyone problem. 1.) Suppose A and B are independent and A and C are mutually exclusive with P[A]=O.5, P[AB] = 0.3 and P[A uC] = 0.7. Find the following probabilities (4 pts each): P[B] , P[C] , P[A uB] , P[A I B] , P[AC] . 2.) Decide which of the following are probability distributions? {There may be more than one!) In each case, give reason for your decision (5 pts each). a) x f(x) b) * c) x f(x) d) x f(x) 1 0.2 o 1.0 22 0.2 -2 0.2 2 0.3 33 -0,,3 -1 0.2 3 0.2 34 0.3 0 0.2 5 0.3 45 0.8 1 0.2 2 0.2 3.) About 10% of African Americans carry the sickle cell gene. For a random sample of persons from the African American population, fmd the probabilities of the following events. (a) (4 pts) Six out of a sample of 9 are free of the sickle cell gene. (b) (8 pts) At most 3 in a sample of ...

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