2. The time required to drive from New York to New Mexico is a discrete random variable.
True
False
18. Bivariate distributions provide probabilities of combinations of two variables.
True
False
62. A national standardized testing company can tell you your relative standing on an exam without divulging the mean or the standard deviation of the exam scores.
True
False
63. The exponential distribution is suitable to model the length of time that elapses before the first telephone call is received by a switchboard.
True
False
88.If X has a normal distribution with mean 60 and standard deviation 6, which value of X corresponds with the value z = 1.96?
A.
x = 48.24
B.
x = 61.96
C.
x = 67.96
D.
x = 71.76
94. The Student t distribution
A.
is symmetrical.
B.
All of these choices are true.
C.
has more area in the tails than the standard normal distribution does.
D.
approaches the normal distribution as the degrees of freedom increase.
100. The Student t distribution with parameter v = 4 has a variance V(t) equal to
A.
4
B.
1
C.
0
D.
2
True
False
18. Bivariate distributions provide probabilities of combinations of two variables.
True
False
62. A national standardized testing company can tell you your relative standing on an exam without divulging the mean or the standard deviation of the exam scores.
True
False
63. The exponential distribution is suitable to model the length of time that elapses before the first telephone call is received by a switchboard.
True
False
88.If X has a normal distribution with mean 60 and standard deviation 6, which value of X corresponds with the value z = 1.96?
A.
x = 48.24
B.
x = 61.96
C.
x = 67.96
D.
x = 71.76
94. The Student t distribution
A.
is symmetrical.
B.
All of these choices are true.
C.
has more area in the tails than the standard normal distribution does.
D.
approaches the normal distribution as the degrees of freedom increase.
100. The Student t distribution with parameter v = 4 has a variance V(t) equal to
A.
4
B.
1
C.
0
D.
2