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alannah007 alannah007
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7 years ago
What is the mean of the wholesaler's monthly sales?
 
  A) 326,400
  B) 135,620
  C) 132,840
  D) 163,200

Q. 2

For two independent random variables X and Y, which of the following identities is always true?
 
  A) E(2X + 3Y) = E(X) + E(Y) + 5
  B) Var(2X + 3Y) =2Var(X) + 3Var(Y)
  C) Var(2X + 3Y) = 4Var(X) + 9Var(Y)
  D) E(2X + 3Y) = 5E(X+Y)

Q. 3

The interquartile range is the average of the first and third quartiles.
 
  Indicate whether the statement is true or false

Q. 4

Discuss briefly the difference between descriptive and inferential statistics.
 
  What will be an ideal response?

Q. 5

If a sample of size 120 is selected, the value of A for the probability P(-A  t
 
  A) = 0.98 is:
  A) 1.960
  B) 2.576
  C) 1.282
  D) 2.326

Q. 6

The median score for the final exam in a statistics class was 85 and 20 percent of the students received a grade greater than 90. What is the probability that a randomly selected exam had a score between 85 and 90?
 
  A) 80 percent
  B) 30 percent
  C) 50 percent
  D) There is not sufficient information to answer this question.
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katewillkatewill
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7 years ago
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alannah007 Author
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7 years ago
I wanna give this person a hug.
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