PRACT STAT W/ ACCESS 6MO LOOSELEAF
4th Edition
ISBN: 9781319215361
Author: BALDI
Publisher: Macmillan Higher Education
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Question
Chapter 18, Problem 18.21E
(a)
To determine
To explain:
The difference in mean SRSs score for the populations of the given sample.
(a)
Expert Solution
Answer to Problem 18.21E
t=6.2993
Explanation of Solution
Given:
| Group | n | ˉx | s |
| Delayed clamping | 21 | 65.30952 | 7.704 |
| Early clamping | 20 | 81.95 | 11.55 |
Concept used:
Formula
Standard error
√s21n1+s22n2
Degree of freedom
=[s21n1+s22n2]2(s21n1)2n1−1+(s21n1)2n2−1
Significance level
α=1−confidence
Calculation:
n1=21,¯x1=65.30952,s1=7.704668n2=20,¯x2=81.95,s2=11.55183
Standard error
=√s21n1+s22n2=√(21.6)2130+(27.6)2115=3.196
Degree of freedom
=[s21n1+s22n2]2(s21n1)2n1−1+(s21n1)2n2−1=39
At 95% confidence interval for the proportion p
Critical z value
=zα/2=2.0227
Margin of error
t=zα/2SEt=1.96(3.971)t=6.2993
(b)
To determine
To explain:
The difference in mean for the populations of the given sample.
(b)
Expert Solution
Answer to Problem 18.21E
(−22.8,−10.5)
Explanation of Solution
Given:
| Group | n | ˉx | s |
| Delayed clamping | 21 | 65.30952 | 7.704 |
| Early clamping | 20 | 81.95 | 11.55 |
Concept used:
Formula
Standard error
√s21n1+s22n2
Degree of freedom
=[s21n1+s22n2]2(s21n1)2n1−1+(s21n1)2n2−1
Significance level
α=1−confidence
Calculation:
n1=21,¯x1=65.30952,s1=7.704668n2=20,¯x2=81.95,s2=11.55183
Standard error
=√s21n1+s22n2=√(21.6)2130+(27.6)2115=3.196
Degree of freedom
=[s21n1+s22n2]2(s21n1)2n1−1+(s21n1)2n2−1=39
At 95% confidence interval for the proportion p
Critical z value
=zα/2=2.0227
Margin of error
E=zα/2SEE=1.96(3.971)E=6.2993
The 95% confidence interval for difference
=¯x1−¯x2±zα/2SE=(65.30952−81.95)±6.1744=−16.6405±6.1744=(−22.8,−10.5)
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Chapter 18 Solutions
PRACT STAT W/ ACCESS 6MO LOOSELEAF
Ch. 18 - Prob. 18.1AYKCh. 18 - Prob. 18.2AYKCh. 18 - Prob. 18.3AYKCh. 18 - Prob. 18.4AYKCh. 18 - Prob. 18.5AYKCh. 18 - Prob. 18.6AYKCh. 18 - Prob. 18.7AYKCh. 18 - Prob. 18.8AYKCh. 18 - Prob. 18.9AYKCh. 18 - Prob. 18.10AYK
Ch. 18 - Prob. 18.11CYSCh. 18 - Prob. 18.12CYSCh. 18 - Prob. 18.13CYSCh. 18 - Prob. 18.14CYSCh. 18 - Prob. 18.15CYSCh. 18 - Prob. 18.16CYSCh. 18 - Prob. 18.17CYSCh. 18 - Prob. 18.18CYSCh. 18 - Prob. 18.19CYSCh. 18 - Prob. 18.20CYSCh. 18 - Prob. 18.21ECh. 18 - Prob. 18.22ECh. 18 - Prob. 18.23ECh. 18 - Prob. 18.24ECh. 18 - Prob. 18.25ECh. 18 - Prob. 18.26ECh. 18 - Prob. 18.27ECh. 18 - Prob. 18.28ECh. 18 - Prob. 18.29ECh. 18 - Prob. 18.30ECh. 18 - Prob. 18.31ECh. 18 - Prob. 18.32ECh. 18 - Prob. 18.33ECh. 18 - Prob. 18.34ECh. 18 - Prob. 18.35ECh. 18 - Prob. 18.36ECh. 18 - Prob. 18.37ECh. 18 - Prob. 18.38ECh. 18 - Prob. 18.39ECh. 18 - Prob. 18.40ECh. 18 - Prob. 18.41ECh. 18 - Prob. 18.42ECh. 18 - Prob. 18.43E
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