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216339 216339
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7 years ago
When testing for the difference between the means of two independent populations with equal variances and with samples of sizes n1 = 20 and n2 = 20, what is the number of degrees of freedom?
 
  A) 40
  B) 38
  C) 20
  D) 19

Q. 2

Let X1, X2,......,Xk be a set of k continuous random variables. The function F(x1, x2, .....,xk)which defines the probability that simultaneously X1 < x1, X2 < x2 and so on is called a:
 
  A) marginal distribution function.
  B) marginal cumulative distribution function.
  C) joint cumulative distribution function.
  D) normal distribution function.

Q. 3

If X and Y are random variables, the sum of all the conditional probabilities of X given a specific value of Y will always be:
 
  A) the average of the possible values of X.
  B) the average of the possible values of Y.
  C) 1.
  D) 0.

Q. 4

Which of the following distributions is used when estimating the population mean from a normal population with unknown variance?
 
  A) the t distribution with n + 1 degrees of freedom
  B) the t distribution with n degrees of freedom
  C) the t distribution with n - 1 degrees of freedom
  D) the t distribution with 2n degrees of freedom

Q. 5

The median, the second quartile, and the 50th percentile are all the same.
 
  Indicate whether the statement is true or false
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216339 Author
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7 years ago
Smart ... Thanks!
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this is exactly what I needed
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