(a)
To Explain: that this is an experiment study or observational study.
(a)
Answer to Problem 2CRE
Observational study
Explanation of Solution
Given:
Experiment Study
In order to study their reactions, an experiment intentionally forces certain treatment upon individuals.
Observational Study
Without disrupting the scene, they are studying, an observational study attempts to collect details.
Therefore, Observational study
(b)
To Construct: and interpret a 95 % confidence interval for the difference in the proportion of female Hispanic drivers who wear seat belts in the two cities.
(b)
Answer to Problem 2CRE
(0.149, 0.353)
Explanation of Solution
Given:
Formula used:
For the confidence interval
Calculation:
The sample proportions are
For the confidence level
the z-score is
The confidence interval are
95% are sure that the percentage of Hispanic female drivers in New York is between 0.149 and 0.353 higher than the proportion of Hispanic female drivers in Boston.
(c)
To explain: the confidence interval in part (b) provides strong evidence that this is valid for Hispanic female drivers, to support the response.
(c)
Answer to Problem 2CRE
Yes
Explanation of Solution
Given:
From part (b)
(0.149, 0.353)
In the absence of a confidence interval of 0, the interval suggests that a lower proportion of drivers in Boston are wearing seat belts than in New York and that there is ample evidence supporting the claim.
Chapter 10 Solutions
The Practice of Statistics for AP - 4th Edition
Additional Math Textbook Solutions
Introductory Statistics (10th Edition)
Fundamentals of Statistics (5th Edition)
Elementary Statistics: Picturing the World (6th Edition)
STATS:DATA+MODELS-W/DVD
Statistics for Business and Economics (13th Edition)
Essentials of Statistics (6th Edition)
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