Concept explainers
(a)
To explain is the death rate among the movie crew unusually high.
(a)
Answer to Problem 31E
The death rate among the movie crew is unusually high.
Explanation of Solution
It is given in the question that a total of
Thus, let us check the appropriate conditions and assumptions for inference to proceed further to test hypothesis as:
Random condition: It is satisfied as we assumed that the sample was randomly selected from the population.
Independent condition: It is satisfied as we can assume that the sample is independent.
Success/failure condition: It is satisfied because both are greater than ten as,
Thus, all the conditions are satisfied. Thus, for this first we have to select
So, by putting the values above by using the calculator we will get the result as,
The value of z-statistics and the P-value will be then,
And as we know if the P-value is smaller than the significance level, then reject the null hypothesis, so, we have,
Thus, we conclude that the death rate among the movie crew is unusually high.
(b)
To explain does this prove that exposure to radiation increases the risk of cancer.
(b)
Answer to Problem 31E
No, this does not prove that exposure to radiation increases the risk of cancer.
Explanation of Solution
It is given in the question that a total of
The value of z-statistics and the P-value will be then,
And as we know if the P-value is smaller than the significance level, then reject the null hypothesis, so, we have,
Thus, we conclude that the death rate among the movie crew is unusually high. Thus, we can say that no, this does not prove that exposure to radiation increases the risk of cancer because there is no definitive proof. We cannot prove anything, only support our conclusion.
Chapter 20 Solutions
Stats: Modeling the World Nasta Edition Grades 9-12
Additional Math Textbook Solutions
Basic Business Statistics, Student Value Edition
Fundamentals of Statistics (5th Edition)
Statistical Reasoning for Everyday Life (5th Edition)
Elementary Statistics (13th Edition)
Elementary Statistics: Picturing the World (7th Edition)
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