An advertisement for a new toothpaste claims that it reduces cavities of children in their cavity-prone years. Cavities per year for this age group are normal with mean 3 and standard deviation 1. A study of 2500 children who used this toothpaste found an average of 2.95 cavities per child. Assume the standard deviation of the number of cavities of a child using this new toothpaste remains equal 1. a) Are these data strong enough, at the 5% level of significance, to establish a claim of the toothpaste advertisement? b) Do the data convince you to switch to this new toothpaste?
An advertisement for a new toothpaste claims that it reduces cavities of children in their cavity-prone years. Cavities per year for this age group are normal with mean 3 and standard deviation 1. A study of 2500 children who used this toothpaste found an average of 2.95 cavities per child. Assume the standard deviation of the number of cavities of a child using this new toothpaste remains equal 1. a) Are these data strong enough, at the 5% level of significance, to establish a claim of the toothpaste advertisement? b) Do the data convince you to switch to this new toothpaste?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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An advertisement for a new toothpaste claims that it reduces cavities of children in
their cavity-prone years. Cavities per year for this age group are normal with mean 3 and
standard deviation 1. A study of 2500 children who used this toothpaste found an
average of 2.95 cavities per child. Assume the standard deviation of the number of
cavities of a child using this new toothpaste remains equal 1.
a) Are these data strong enough, at the 5% level of significance, to establish a claim of
the toothpaste advertisement?
b) Do the data convince you to switch to this new toothpaste?
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