8.12 C A random sample of 113 convicted rapists in a state prison system completed a program de- signed to change their attitudes towards women, sex, and violence before being released on pa- role. Fifty-eight eventually became repeat sex of- fenders. Is this recidivism rate significantly dif- ferent from the rate for all offenders in that state (57%)P Summarize your conclusions in a sen- tence or two. (HINT: You must use the informa- tion given in tbe problem to compute a sample proportion. Remember to convert the population percentage to a proportion.)

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8.12 CJ A random sample of 113 convicted rapists in
a state prison system completed a program de-
signed to change their attitudes towards women,
sex, and violence before being released on pa-
role. Fifty-eight eventually became repeat sex of-
fenders. Is this recidivism rate significantly dif-
ferent from the rate for all offenders in that state
(57%)? Summarize your conclusions in a sen-
tence or two. (HINT: You must use the informa-
tion given in the problem to compute a sample
proportion. Remember to convert the population
percentage to a proportion.)
Transcribed Image Text:8.12 CJ A random sample of 113 convicted rapists in a state prison system completed a program de- signed to change their attitudes towards women, sex, and violence before being released on pa- role. Fifty-eight eventually became repeat sex of- fenders. Is this recidivism rate significantly dif- ferent from the rate for all offenders in that state (57%)? Summarize your conclusions in a sen- tence or two. (HINT: You must use the informa- tion given in the problem to compute a sample proportion. Remember to convert the population percentage to a proportion.)
8.8 SOC A school system has assigned several hundred
"chronic and severe underachievers" to an altema-
tive echucational experience. To assess the program,
a random sample of 35 has been selected for com-
parison with all studkents in the system.
a. In terms of GPA, did the program work?
Systemwide GPA
Program GPA
X = 2.55
s= 0.70
N= 35
4 = 2.47
b. In terms of absenteeism (number of days
missed per year), what can be said about the
success of the program?
Systemwide
Program
u - 6.137
X= 4.78
s= 1.11
N= 35
c. In terms of standardized test scores in math
and reading, was the program a success?
Math Test-
Math Test-
Systemwide
Program
H = 103
X = 106
s= 2.0
N- 35
Reading Test-
Systemwide
Reading Test-
Program
X = 113
s= 2.0
N= 35
A = 110
(HINT: Note the wording of the research ques-
tions. Is a one-tailed test justified? Is the program
a success if the students in the program are no
different from students systemwide? What if the
program students were performing at lower lev-
els? If a one-tailed test is used, what form should
tbe research bypotbesis take? Where will the criti-
cal region begin?)
Transcribed Image Text:8.8 SOC A school system has assigned several hundred "chronic and severe underachievers" to an altema- tive echucational experience. To assess the program, a random sample of 35 has been selected for com- parison with all studkents in the system. a. In terms of GPA, did the program work? Systemwide GPA Program GPA X = 2.55 s= 0.70 N= 35 4 = 2.47 b. In terms of absenteeism (number of days missed per year), what can be said about the success of the program? Systemwide Program u - 6.137 X= 4.78 s= 1.11 N= 35 c. In terms of standardized test scores in math and reading, was the program a success? Math Test- Math Test- Systemwide Program H = 103 X = 106 s= 2.0 N- 35 Reading Test- Systemwide Reading Test- Program X = 113 s= 2.0 N= 35 A = 110 (HINT: Note the wording of the research ques- tions. Is a one-tailed test justified? Is the program a success if the students in the program are no different from students systemwide? What if the program students were performing at lower lev- els? If a one-tailed test is used, what form should tbe research bypotbesis take? Where will the criti- cal region begin?)
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