Soc 510: Practice Exam 1
Use the following to answer questions 1-3
In a statistics class with 136 students, the professor records how much money each student has in their
possession during the first class of the semester. The histogram shown below represe
SOC510 Homework #3 Solution
Chapter 3.
3.2
(a) The density curve forms a 1/3 (height) 3 (distance), which has area 1.
(b) 1/3 (probability) * 1 (distance) = 1/3
(c) 0.3 * 1/3 = .10
3.4
(a) Mean is C, median is B (the right skew pulls the mean to the right
Soc 510
Additional Practice Exam 3
1. Does cocaine use by pregnant women cause their babies to have low birth weight? To study this question
birth weights of babies of women who tested positive for cocaine during a drug-screening test were compared
with t
Soc 510 Summary
Hypothesis Testing
Identify the information given to you in the question
1. Set up your hypotheses
Null Hypothesis (H0)
One group mean: H0: = #
Two groups mean: H0: =2
One group proportion: H0: p= #
Two groups proportion: H0: p=p2
where #
Soc 510
Practice Exam 2
1. You are interested in the question How much time do sociology majors at KU spend on the Internet using
social networking sites? You want to do a pilot study with a simple random sample of 5 students from Soc
510. You obtain the
Soc 510
Practice Exam 3
1. A measure of hyperactivity is given to a SRS of elementary school children in Douglas County schools. For
the 75 boys in the study, the scores were normally distributed with a mean of 14.6, and a standard deviation of
4.2. For t
Homework # 8: Chapter 15 - Solution
1. H0 : $32
Ha : > $32
(a) z =
33.532
4.5/ 45
= 2.24
(b) Critical Value at = .05 (i.e., 95% condence level): c.v. = +1.65
(c) Reject null hypothesis, so it is likely that the cost of book is higher than $32.
2. H0 : = 4
SOC510 Homework #6: Chapters 11Solution
Chapter 11
1. A random sample of size 36 is to be selected from a population that has a mean of 50 and
a standard deviation of 10.
(a) Approximately normal distribution
(b) 50
(c) x = 10/ 36 = 1.67
2. Do the followi
SOC510 Homework #2 Solution
Chapter 2.
1. Using using the home run record of 2.4 (p.41), calculate the following statistics.
(a) x=703/19 = 37
(b) x = 37
(c) 1625374573
(d)
(e) IQR = 45-25 = 20
2
(f)
s2
x
=
(g) s2 =
x
2
x2 ( nx)
29047 703
19
=
= 168.67
n1
SOC510 Homework #3 Solution
Chapter 3.
3.2
(a) The density curve forms a 1 1 square, which has area 1.
(b) 1/3
(c) .10
3.4
(a) Mean is C, median is B (the right skew pulls the mean to the right).
(b) Mean B, median B (this distribution is symmetric).
(c)
SOC510 Homework #4
Chapter 4 & 5.
A. Answer 18, using the following data.
work satisfaction(x)
propensity to leave a job(y )
12
44
24
36
17
25
28
23
24
32
36
17
20
24
1. draw a scatterplot (ChangHwan: I added a regression line for your reference)
2. x = 2
SOC510 Homework #6: Chapters 11Solution
Chapter 11
1. A random sample of size 36 is to be selected from a population that has a mean of 50 and
a standard deviation of 10.
(a) Approximately normal distribution
(b) 50
(c) x = 10/ 36 = 1.67
2. Do the followi
Homework # 8: Chapter 15 - Solution
1. H0 : $32
Ha : > $32
(a) z =
33.532
4.5/ 45
= 2.24
(b) Critical Value at = .05 (i.e., 95% condence level): c.v. = +1.65
(c) Reject null hypothesis, so it is likely that the cost of book is higher than $32.
2. H0 : = 4
SOC510 Homework #2 Solution
Chapter 2.
1. Using using the home run record of 2.4 (p.41), calculate the following statistics.
(a) x=703/19 = 37
(b) x = 37
(c) 1625374573
(d)
(e) IQR = 45-25 = 20
2
(f)
s2
x
=
(g) s2 =
x
2
x2 ( nx)
29047 703
19
=
= 168.67
n1
SOC510 Homework #3 Solution
Chapter 3.
3.2
(a) The density curve forms a 1 1 square, which has area 1.
(b) 1/3
(c) .10
3.4
(a) Mean is C, median is B (the right skew pulls the mean to the right).
(b) Mean B, median B (this distribution is symmetric).
(c)
SOC510 Homework #4
Chapter 4 & 5.
A. Answer 18, using the following data.
work satisfaction(x)
propensity to leave a job(y )
12
44
24
36
17
25
28
23
24
32
36
17
20
24
1. draw a scatterplot (ChangHwan: I added a regression line for your reference)
2. x = 2