Question

A study of identity theft looked at how well consumers protect themselves from this increasingly prevalent crime. The behaviors of 62 college students were compared with the behaviors of 57nonstudents. One of the questions was "When asked to create a password, I have used either my mother's maiden name, or my pet's name, or my birth date, or the last four digits of my social security number, or a series of consecutive numbers." For the students, 22 agreed with this statement while 27 of the nonstudents agreed.

(a) Display the data in a two-way table.

Students | Nonstudents | Total | |||

Agreed | |||||

Disagreed | |||||

Total | 119 |

Perform the chi-square test. (Round your *χ*^{2} to
three decimal places and round your *P*-value to four
decimal places.)

χ^{2} |
= | |

df | = | |

P-value |
= |

Summarize the results.

We cannot conclude at the 5% level that students and nonstudents differ in the response to this question.We can conclude at the 5% level that students and nonstudents differ in the response to this question.

(b) Reanalyze the data using the methods for comparing two
proportions that we studied in the previous chapter. Compare the
results and verify that the chi-square statistic is the square of
the *z* statistic. (Test students who agreed minus
nonstudents who agreed. Round your *z* to two decimal places
and round your *P*-value to four decimal places.)

z |
= | |

P-value |
= |

(c) The students in this study were junior and senior college
students from two sections of a course in Internet marketing at a
large northeastern university. The nonstudents were a group of
individuals who were recruited to attend commercial focus groups on
the West Coast conducted by a lifestyle marketing organization.
Discuss how the method of selecting the subjects in this study
relates to the conclusions that can be drawn from it.

Answer #1

A study of identity theft looked at how well consumers protect
themselves from this increasingly prevalent crime. The behaviors of
64 college students were compared with the behaviors of 57
nonstudents. One of the questions was "When asked to create a
password, I have used either my mother's maiden name, or my pet's
name, or my birth date, or the last four digits of my social
security number, or a series of consecutive numbers." For the
students, 25 agreed with...

A study of identity theft looked at how well consumers protect
themselves from this increasingly prevalent crime. The behaviors of
61 college students were compared with the behaviors of 58
nonstudents. One of the questions was "When asked to create a
password, I have used either my mother's maiden name, or my pet's
name, or my birth date, or the last four digits of my social
security number, or a series of consecutive numbers." For the
students, 22 agreed with...

A recent study of undergraduates looked at gender differences in
dieting trends. There were 187 women and 104 men who participated
in the survey. The table below summarizes whether a student tried a
low-fat diet or not by gender:
Gender Tried low-fat diet
Women Men
Yes 38 8
No
(b) Summarize the data numerically. What percent of each gender
has tried low-fat diets? (Round your answers to two decimal
places.) women % men % (c) Test that there is no...

A recent study of undergraduates looked at gender differences in
dieting trends. There were 181 women and 103 men who participated
in the survey. The table below summarizes whether a student tried a
low-fat diet or not by gender:
Gender
Tried low-fat diet
Women
Men
Yes
38
8
No
(a) Fill in the missing cells of the table.
Gender
Tried low-fat diet
Women
Men
Yes
38
8
No
(b) Summarize the data numerically. What percent of...

The categories of a categorical variable are given along with
the observed counts from a sample. The expected counts from a null
hypothesis are given in parentheses. Compute the χ2-test statistic,
and use the χ2-distribution to find the p-value of the
test.
Category
A
B
C
D
Observed
(Expected)
25(20)
35(40)
50(60)
90(80)
Round your answer for the chi-square statistic to two decimal
places, and your answer for the p-value to four decimal
places.
chi-square statistic = Enter your...

Sixty-four students in an introductory college economics class
were asked how many credits they had earned in college, and how
certain they were about their choice of major. At α = .10,
is the degree of certainty independent of credits earned?
Credits Earned
Very
Uncertain
Somewhat
Certain
Very
Certain
Row Total
0 – 9
12
6
5
23
10 – 59
9
5
7
21
60 or more
4
9
12
25
Col Total
25
20
24
69
(a) At...

A recent study of undergraduates looked at gender differences in
dieting trends. There were 185 women and 105 men who participated
in the survey. The table below summarizes whether a student tried a
low-fat diet or not by gender:
Gender
Tried low-fat diet
Women
Men
Yes
39
9
No
(a) Fill in the missing cells of the table.
Gender
Tried low-fat diet
Women
Men
Yes
39
9
No
(b) Summarize the data numerically. What percent of...

A recent study of undergraduates looked at gender differences in
dieting trends. There were 188 women and 105 men who participated
in the survey. The table below summarizes whether a student tried a
low-fat diet or not by gender:
Gender
Tried low-fat diet
Women
Men
Yes
40
9
No
(a) Fill in the missing cells of the table.
Gender
Tried low-fat diet
Women
Men
Yes
40
9
No
(b) Summarize the data numerically. What percent of...

A recent study of undergraduates looked at gender differences in
dieting trends. There were 182 women and 108 men who participated
in the survey. The table below summarizes whether a student tried a
low-fat diet or not by gender:
Gender
Tried low-fat diet
Women
Men
Yes
36
9
No
(a) Fill in the missing cells of the table.
Gender
Tried low-fat diet
Women
Men
Yes
36
9
No
(b) Summarize the data numerically. What percent of...

JKESTAT11 7.E.035.
MY NOTES
ASK YOUR TEACHER
Consider the approximately normal population of heights of
male college students with mean μ = 67 inches and standard
deviation of σ = 4.5 inches. A random sample of 13 heights is
obtained.
(a) Describe the distribution of x, height of male college
students.
skewed left
approximately normal
chi-square
skewed right
(b) Find the proportion of male college students whose height
is greater than 71 inches. (Round your answer to four decimal
places.)...

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