Question 1 (true)
3 / 3 pts
When finding percentile ranks for a percentile, the focus is always on
identifying the percentile rank on the left side of a percentile.
True
False
Question 2 (TRUE)
3 / 3 pts
For a normal distribution, the term quartile is similar to the term percentile in
interpretation.
True
False
Question 3 (TRUE)
3 / 3 pts
A vertical line drawn through a normal distribution at z = –0.72 separates the
distribution into two sections. The proportion in the smaller section is 0.2358.
True
False
Question 4 (false)
3 / 3 pts
When the z-score value in a normal distribution is negative, the body is on
the left-hand side of the distribution.
True
False
Question 5 (sampling with replacement)
3 / 3 pts
In order to facilitate independent random sampling, ____ must be utilized.
random assignment
manipulation
sampling with replacement
sampling without replacement
Question 6 (true)
3 / 3 pts
All probabilities can be expressed as decimal values ranging from 0.00 to
1.00.
True
False
Question 7 (A)
3 / 3 pts
Which statement accurately describes the proportions in the tails of a normal
distribution?
(A) Proportions in both the left-hand and right-hand tails tend to be relatively small.
Proportions in both the left-hand and right-hand tails tend to be relatively large.
The proportion in the left-hand tail is larger than the proportion in the right-hand tail.
The proportion in the right-hand tail is larger than the proportion in the left-hand tail.
Question 8 (TRUE)
3 / 3 pts
For a normal distribution, the first quartile corresponds with the 25th
percentile.
True
False
Question 9 (C)
3 / 3 pts
Which statement accurately describes the proportions in the tails of a normal
distribution?
The proportion in the left-hand tail is smaller than the proportion in the right-hand tail.
Proportions in both the left-hand and right-hand tails tend to be relatively large.
(C) Proportions in both tails are the same.
Proportions in both tails are negative.
Question 10 (TRUE)
3 / 3 pts
For a normal distribution, the z-score boundary that separates the lowest
33% of the scores from the rest of the scores is z = –0.44.
True
False
Question 11 (A)
3 / 3 pts
A normal distribution has a mean of µ = 50 with σ = 6. If one score is
randomly selected from this distribution, which is the probability that the
score will be greater than X = 46?
(A)p = 0.7486
p = 0.2514
p = 0.2486
p = 0.7641
Question 12 (D)
3 / 3 pts
A population is normally distributed with a mean of µ = 145 and σ
= 20. Which is the percentile rank for X = 136?
67.36%
35.64%
17.36%
(D)32.64%
IncorrectQuestion 13
0 / 3 pts (Answer 76, incorrect)
Mitchell is getting ready to take a baseball rules exam in order to become
certified as a baseball umpire in his local community. Past scores on the rules
exam form a normal distribution with µ = 80 and σ = 6. Mitchell must score
in the highest 25% of the distribution in order to become a certified umpire.
Which minimum score does Mitchell need to obtain on the rules exam to
become a certified umpire?
X = 76
X = 84
X = 86
X = 81
Question 14 (b)
3 / 3 pts
A normal distribution has a mean of µ = 40 with σ = 8. If one score is
randomly selected from this distribution, which is the probability that the
score will be less than X = 34?
p = 0.7734
(b) p = 0.2266
p = 0.2745
p = 0.4532
Question 15 (c)
3 / 3 pts
Which proportion of a normal distribution is located between the mean and z
= +1.40?
0.9192
0.0808
(c)0.4192
0.8045
