Question
In: Statistics and Probability
A group of 20 prisoners in a particular cellblock were tested on their knowledge of the...
A group of 20 prisoners in a particular cellblock were tested on their knowledge of the
rules of the institution. The marks (out of a possible score of 70) were as follows:
31, 28, 27, 19, 18, 18, 41, 0, 30, 27, 27, 36, 41, 64, 27, 39, 20, 28, 35, 30.
a) Calculate the range, variance and standard deviation for these data.
b) Remove the largest and smallest scores. Re-calculate the range, variance and
standard deviation.
c) Compare the measures of dispersion for the two distributions. Are there any
differences? If so, how would you account for them?
Solutions
orchestra answered 2 years agoRelated Solutions
A group of students with no knowledge of the endocrine system were given a test on...
A group of students with no knowledge of the endocrine
system were given a test on insulin function before (pre-test) and
after (post-test) an explanation; the data is presented in Table
D.
Table D. The effect of an explanation of the endocrine
system on pre- and post-test scores (%).
Student
Pre-test
Post-test
1
25
59
2
33
45
3
37
44
4
39
51
5
31
41
6
31
42
7
27
58
a. Do you use a paired or...
A group of 65 new substance abuse counselors were tested for their understanding of a new...
A group of 65 new substance abuse counselors were tested for
their understanding of a new confidentiality procedure. The highest
test score was a 92; the mean was 88 and the range was 6. The next
day, a counselor who was absent took the test and scored a 100.
Indicate whether adding the late counselor’s score to the rest of
the scores will increase,
decrease or likely not change the
following descriptive measures.
Median
Variance
Range
Standard Deviation
In a survey of a group of men, the heights in the 20-29 age group were...
In a survey of a group of men, the heights in the 20-29 age
group were normally distributed, with a mean of 69.7 inches and a
standard deviation of 2.0 inches. A study participant is randomly
selected. Complete parts (a) through (d) below.
(a) Find the probability that a study participant has a height
that is less than 65 inches.
The probability that the study participant selected at random is
less than 65 inches tall is
. 0094. (Round to...
In a survey of a group of men, the heights in the 20-29 age group were...
In a survey of a group of men, the heights in the 20-29 age
group were normally distributed, with a mean of 67,4 inches and a
standard deviation of 2.0 inches. A study participant is randomly
selected. Complete parts (a) through (d) below.
(a) Find the probability that a study participant has a height
that is less than 68 inches.
The probability that the study participant selected at random is
less than 68 inches tall is
nothing. (Round to four...
In a survey of a group of men, the heights in the 20-29 age group were...
In a survey of a group of men, the heights in the 20-29 age
group were normally distributed, with a mean of 67.9 inches and a
standard deviation of 4.0 inches. A study participant is randomly
selected. a)Find the probability that a study participant has a
height that is less than 67 inches. b) Find the probability that a
study participant has a height that is between 67 and 72 inches.
c)Find the probability that a study participant has a...
In a survey of a group of men, the heights in the 20-29 age group were...
In a survey of a group of men, the heights in the 20-29 age
group were normally distributed, with a mean of 67.1 inches and a
standard deviation of 3.0 inches. A study participant is randomly
selected. Complete parts (a) through (d) below.
(a) Find the probability that a study participant has a height
that is less than 68 inches. The probability that the study
participant selected at random is less than 68 inches tall is ___
(round to 4...
In a survey of a group of men, the heights in the 20-29 age group were...
In a survey of a group of men, the heights in the 20-29 age
group were normally distributed, with a mean of
69.6 inches and a standard deviation of 2.0 inches. A study
participant is randomly selected. a) Find a probability that a
study participant has a height that is less than 66 inches. b) Find
the probability that a study participant has a height that is
between 66 and 72. c) Find the probability that a study participant
has...
In a survey of a group of men, the heights in the 20-29 age group were...
In a survey of a group of men, the heights in the 20-29 age
group were normally distributed, with a mean of
69.3 inches and a standard deviation of 2.0 inches. A study
participant is randomly selected. Complete parts (a) through (d)
below.
(a) Find the probability that a study participant has a height
that is less than
65 inches.
)(b) Find the probability that a study participant has a
height that is between
65 and 70 inches
)(c) Find...
n a survey of a group of men, the heights in the 20-29 age group were...
n a survey of a group of men, the heights in the 20-29 age
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standard deviation of 3.0 inches. A study participant is randomly
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A group of African children were tested for both sickle-cell and malaria. Out of the whole...
A group of African children were tested for both sickle-cell and
malaria. Out of the whole group, 23% had sickle-cell, 35% had
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the above information about the incidence of sicklecell and malaria
among these children. Complete all marginal totals as well as the
body of the table. [4] (b) What proportion of children with malaria
also had sickle-cell? [2] (c) Among children who had sickle-cell,
what proportion did...
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