The number of combinations of size k from a particular set is ________ the number of permutations of size k.
a.the same as
b.larger than
c.smaller than
d.equal to
Q. 2
What is any unordered subset of size k from n distinct objects called?
a.Mutually exclusive
b.Permutation
c.Combination
d.Factorial
Q. 3
Suppose a committee of two people is to be chosen from a group of five people. How many ways can the committee be chosen?
a.20
b.25
c.120
d.5
Q. 4
Suppose a painter is deciding which color combination to use when painting a house. The main color of the house can be one of five possible colors and the trim can be one of three possible colors. How many different ways could the house be painted?
a.5
b.15
c.125
d.3
Q. 5Which of the following is the formula for a permutation or
r symbols taken
k at a time?
a.
b.
c.
d.
Q. 6 Using the following table for gender (
X) and level of education (
Y), what is the marginal probability distribution for level of education (
Y)?
a.
b.
c.
d.
Q. 7 Suppose a study of gives the following summary data: Cov(
X,
Y) = 0.70,
,
. What is the value for the correlation,
?
a.
b.
c.
d.
Q. 8 Suppose the following table represents the probabilities associated with the random variables
X and
Y where
X = the gender of the individual and
Y = the highest level of education of the individual. What is the probability that a randomly selected individual is female and has at least an undergraduate degree?
a.0.40
b.0.52
c.0.75
d.0.30
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