Question

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 this statement while 29 of the nonstudents agreed.

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

Students Nonstudents Total

Agreed

Disagreed

Total 121

Perform the chi-square test. (Round your χ2 to three decimal places and round your P-value to four decimal places.)

χ2 =

df =

P-value =

Summarize the results.

We can conclude at the 5% level that students and nonstudents differ in the response to this question.

We cannot 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

**(C)**

The students were selected were doing 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. So, both groups are educated enough to know the pros and cons of identity theft. So, proportion of students and nonstudents who agree/disagree with the statements may be approximately identical.

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 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...

A recent study of undergraduates looked at gender differences in
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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
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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
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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...

A presidential candidate's aide estimates that, among all
college students, the proportion p who intend to vote in
the upcoming election is at least 60%. If 111 out of a random
sample of 210 college students expressed an intent to vote, can we
reject the aide's estimate at the 0.01 level of significance?
Perform a one-tailed test. Then fill in the table below.
Carry your intermediate computations to at least three decimal
places and round your answers as specified in...

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
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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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