Section 1
1)
A class consists of 30 males and 20 females. If one student is randomly selected from the class,
what is the probability of selecting a male?
(1pts)
Question 1 - A class consists of 30 males and 20 females. If one student is randomly selected
from the class, what is the probability of selecting a male?
20/50
30/50
1/30
30/20
2)
A population distribution has a standard deviation of 5. What position in this distribution is
identified by a z-score of -2.00?
(1pts)
Question 2 - A population distribution has a standard deviation of 5. What position in this
distribution is identified by a z-score of -2.00?
2 points below the mean
10 points below the mean
2 points above the mean
10 points above the mean
3)
A sample with mean score of 100 and standard deviation of 15 is transformed into z-scores.
After the transformation, what are the values for the mean and standard deviation for the
sample of z-scores? (First score for mean, second score for standard deviation)
(1pts)
Question 3 - A sample with mean score of 100 and standard deviation of 15 is transformed into
z-scores. After the transformation, what are the values for the mean and standard deviation for
the sample of z-scores? (First score for mean, second score for standard deviation)
100 and 15
0 and 15
100 and 1
, 0 and 1
4)
A vertical line is drawn through a normal distribution at z = 0.70. What proportion of the
distribution is on the right-hand side of the line?
(1pts)
Question 4 - A vertical line is drawn through a normal distribution at z = 0.70. What proportion
of the distribution is on the right-hand side of the line?
0.2420
0.6179
0.7580
0.3821
5)
Consider the proportions in the tails of the normal distribution. Which of the following
statement is true?
(1pts)
Question 5 - Consider the proportions in the tails of the normal distribution. Which of the
following statement is true?
Proportions in the right-hand tail are positive, and proportions in the left-hand tail are
negative.
Proportions in the right-hand tail are negative, and proportions in the left-hand tail are
positive.
Proportions in both tails are positive.
Proportions in both tails are negative.
6)
Find the z-score that corresponds to a point that is one standard deviation below the mean.
(1pts)
Question 6 - Find the z-score that corresponds to a point that is one standard deviation below
the mean.
-1
+1
-10
Impossible to determine without knowing the value of the standard deviation
1)
A class consists of 30 males and 20 females. If one student is randomly selected from the class,
what is the probability of selecting a male?
(1pts)
Question 1 - A class consists of 30 males and 20 females. If one student is randomly selected
from the class, what is the probability of selecting a male?
20/50
30/50
1/30
30/20
2)
A population distribution has a standard deviation of 5. What position in this distribution is
identified by a z-score of -2.00?
(1pts)
Question 2 - A population distribution has a standard deviation of 5. What position in this
distribution is identified by a z-score of -2.00?
2 points below the mean
10 points below the mean
2 points above the mean
10 points above the mean
3)
A sample with mean score of 100 and standard deviation of 15 is transformed into z-scores.
After the transformation, what are the values for the mean and standard deviation for the
sample of z-scores? (First score for mean, second score for standard deviation)
(1pts)
Question 3 - A sample with mean score of 100 and standard deviation of 15 is transformed into
z-scores. After the transformation, what are the values for the mean and standard deviation for
the sample of z-scores? (First score for mean, second score for standard deviation)
100 and 15
0 and 15
100 and 1
, 0 and 1
4)
A vertical line is drawn through a normal distribution at z = 0.70. What proportion of the
distribution is on the right-hand side of the line?
(1pts)
Question 4 - A vertical line is drawn through a normal distribution at z = 0.70. What proportion
of the distribution is on the right-hand side of the line?
0.2420
0.6179
0.7580
0.3821
5)
Consider the proportions in the tails of the normal distribution. Which of the following
statement is true?
(1pts)
Question 5 - Consider the proportions in the tails of the normal distribution. Which of the
following statement is true?
Proportions in the right-hand tail are positive, and proportions in the left-hand tail are
negative.
Proportions in the right-hand tail are negative, and proportions in the left-hand tail are
positive.
Proportions in both tails are positive.
Proportions in both tails are negative.
6)
Find the z-score that corresponds to a point that is one standard deviation below the mean.
(1pts)
Question 6 - Find the z-score that corresponds to a point that is one standard deviation below
the mean.
-1
+1
-10
Impossible to determine without knowing the value of the standard deviation
