عبـآقره الاحصـآء .. Final Exam

[ارقى البنات]

17. Determine the number of all possible outcomes of guessing the last two digits in a telephone
number if repetition of digits is allowed.
A) 20 B) 30 C) 100 D) 1000

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19. If the Spearman rank correlation coefficient ( sr ) equals 0.6, then the relationship can be
described as
A) weak and linear C) positive, strong and non linear
B) moderate and non linear D) positive, moderate and linear

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23. earned a master's degree or is a female
A) 0.45 B) 0.64 C) 0.48 D) 0.7


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26. A die is rolled 5 times. the probability of getting a number 4 one time only is
A) 0.015 B) 0.386 C) 0.167 D) 0.402


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27. If X is a discrete random variable with X 2P(X ) 6 and E (X ) 2
  = = . The variance for the
probability distribution of X is
A) 1.141 B) 4 C) 1.732 D) 2

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33. Your correct decision is
A) Both R1 and R2 are the same C) R1 is better than R2
B) R2 is better than R1 D) Insufficient information to make a decision

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34.If a random sample of size 9 is selected at random, find the probability that the mean income of
the sample is between $2500 and $ 3500
A) 0.9974 B) 0.4987 C) 0.5601 D) 0.0013


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35. The probability that a person selected at random earns a monthly income between $2500 and $
3500
A) 0.3174 B) 0.3413 C) 0.6826 D) 0.1587

دي الي مـآعرفت آحلهــآآ ,,
آتمنى تسـآعدني فيهـآآ ,,

تحيـآـآتي ,, آرقى البنــآآـآت ..~