(a)
To Explain: that this is an experiment or not.
(a)
Answer to Problem 21E
No
Explanation of Solution
This is not an experiment, as subjects have not been arbitrary assigned to treatment groups. This is an observational study
(b)
To conduct: a suitable hypothesis and give conclusion.
(b)
Explanation of Solution
Given:
Formula used:
Calculation:
hypotheses would be
Normal model conducts a two-proportion z-test
Pool the sample data
SE to estimate
The observed proportions is
The z-score is
The P-value is
P-value = 0.0004 is very small, we do not consider the null hypothesis, we do conclude that the strategies of clinics are not efficient for older women.
(c)
To find: the difference between a confidence interval and an interpretation interval, if there was a difference when concluded.
(c)
Answer to Problem 21E
(0.0999, 0.2779)
Explanation of Solution
Formula used:
For the confidence interval
Calculation:
For a 95% confidence level,
So, the 95% confidence interval is
A 95 % confidence Interval for the difference Between me, women under the age of 38 and women age 38 and older are living births (0.0999, 0.2779). On the basis of these samples, we are 95 % sure that live births for women under the age of 38 are 10% to 27.8% higher than live births for women 38 and older. The success / failure condition is not fulfilled, because success in women aged 38 and older is 7, which is less than 10. We cannot depend on this confidence Interval.
Chapter 22 Solutions
Stats: Modeling the World Nasta Edition Grades 9-12
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