Concept explainers
(a)
To find: that it is required to find the mean and standard deviation of the numbers of frogs with the trait researcher in his sample.
(a)
Answer to Problem 30E
Mean = 18.75
Standard Deviation = 4.05
Explanation of Solution
Given:
Formula used:
Calculation:
Computing the mean and standard deviation.
Mean number is
Standard deviation is
(b)
To Verify: A normal model may be used by that researcher to estimate the distribution of the number of frogs with the trait.
(b)
Explanation of Solution
Given:
Calculation:
Verifying that, could use a normal model is about to appropriate or not.
Following conditions
Clearly both
Hence, it could be said that, it is about to use the normal model in this situation.
(c)
To explain: this proves that this characteristic has become more prevalent.
(c)
Explanation of Solution
Given:
researcher find that the trait in 22 frogs.
Calculation:
For 22 frogs calculate the corresponding Z value as follows.
Since the value of Z is very small, it can be said that in frogs, the trait has become more general.
Chapter 17 Solutions
Stats: Modeling the World Nasta Edition Grades 9-12
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