MAT302 MIDTERM Exam Study Guide
A variable is classified as ordinal if:
A.there is a natural ordering of categories
B.we track the variable through a period of time
C.there is no natural ordering of categories
D.the data arise from continuous measurements
If a die is rolled one time, find the probability of getting a number greater than 2.
A.2
B.-1
C.5/6
D.4/6
Sue has 10 pictures but only has space in her apartment to hang 4 of them on a wall. The number of different arrangements of four pictures from a selection of ten pictures is:
A.5,040
B.24
C.151,200
D.210
The failure rate for taking the bar exam in Philadelphia is 41%. If 375 people take the bar exam, what is the mean for the number of failures?
A.138.1
B.171.2
C.90.7
D.153.8
A researcher surveyed college students to study their opinion about the proposed change in smoking rules. The researcher asked a group of 30 students: 12 of them supported the change, 13 of them did not, and 5 had no opinion. This is not a binomial model because...
A.30 students are not enough for a good sample
B....less than half of the students supported the change.
C....there are 3 possible outcomes, not 2.
D....the students who strongly supported the change and those who only mildly supported the change are counted the same.
The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months. x 0
1
2
3
4
5
P (X=x)
0.20
0.25
0.20
0.15
0.10
0.10
Find P( X < 3)
A.0.20
B.0.15
C.0.80
D.0.85
Given that Z is a standard normal random variable, P(-1.0 < Z < 1.5) is
A.0.9332
B.0.0919
C.0.8413
D.0.7745
The standard deviation of a probability distribution must be:
A.a negative number
B.a nonnegative number
C.less than the value of the mean
D.a number between 0 and 1
If Z is a standard normal random variable, then the value z for which P(-z < Z < z) equals
A.there is a natural ordering of categories
B.we track the variable through a period of time
C.there is no natural ordering of categories
D.the data arise from continuous measurements
If a die is rolled one time, find the probability of getting a number greater than 2.
A.2
B.-1
C.5/6
D.4/6
Sue has 10 pictures but only has space in her apartment to hang 4 of them on a wall. The number of different arrangements of four pictures from a selection of ten pictures is:
A.5,040
B.24
C.151,200
D.210
The failure rate for taking the bar exam in Philadelphia is 41%. If 375 people take the bar exam, what is the mean for the number of failures?
A.138.1
B.171.2
C.90.7
D.153.8
A researcher surveyed college students to study their opinion about the proposed change in smoking rules. The researcher asked a group of 30 students: 12 of them supported the change, 13 of them did not, and 5 had no opinion. This is not a binomial model because...
A.30 students are not enough for a good sample
B....less than half of the students supported the change.
C....there are 3 possible outcomes, not 2.
D....the students who strongly supported the change and those who only mildly supported the change are counted the same.
The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months. x 0
1
2
3
4
5
P (X=x)
0.20
0.25
0.20
0.15
0.10
0.10
Find P( X < 3)
A.0.20
B.0.15
C.0.80
D.0.85
Given that Z is a standard normal random variable, P(-1.0 < Z < 1.5) is
A.0.9332
B.0.0919
C.0.8413
D.0.7745
The standard deviation of a probability distribution must be:
A.a negative number
B.a nonnegative number
C.less than the value of the mean
D.a number between 0 and 1
If Z is a standard normal random variable, then the value z for which P(-z < Z < z) equals