Concept explainers
(a)
The probability that the proportion of graduates passing the test is at least 0.20 higher than the proportion of dropouts passing.
(a)
Answer to Problem 6E
The probability that the proportion of red jelly beans in the Child sample is less than or equal to the proportion of red jelly beans in the Adult sample is
Explanation of Solution
Given information:
Proportion of high school graduates that will pass basic literacy test = 80%
Proportion of high school dropouts that will pass basic literacy test = 40%
Number of Random Sample from high school graduates for basic literacy test = 60
Number of Random Sample from high school dropouts for basic literacy test = 75
Let
Are at least
The standard deviation is:
Hence,
The probability that the proportion of graduates who pass the test is at least 0.20 higher than the proportion of dropouts who pass is 0.9955
(b)
To Explain: The difference in the sample proportions (graduate - dropout) who pass the test is exactly
(b)
Answer to Problem 6E
Yes the company claim can be doubted.
Explanation of Solution
Yes, the researcher's claim should be doubted. The probability that the proportion of graduateswho pass the test is at least 0.20 or
Chapter 10 Solutions
The Practice of Statistics for AP - 4th Edition
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