(a)
To Explain: that this is an observation study or an experiment study yes or not.
(a)
Answer to Problem 9CRE
Experiment
Explanation of Solution
An experiment intentionally applies a certain procedure on people to study their reactions. An observational analysis aims to gain details without disrupting the scene they are watching.
(b)
To Explain: on the basis of data, can it infer that leaving a message raises the proportion of households interviewed in the end. Provide sufficient supporting evidence for the responses.
(b)
Answer to Problem 9CRE
Yes
Explanation of Solution
Given:
Formula used:
Calculation:
The hypotheses are
The sample proportion is
The test statistic is
The P-value is the chance of having the value of the test numbers, or a more drastic value.
Reject the null hypothesis if the P-value is lower than the significance level:
Chapter 10 Solutions
The Practice of Statistics for AP - 4th Edition
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