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Sunscreen - Statistics and Claims

by Sue
(USA)










































In a recent article, the author states that 71% of adults do not use sunscreen. Although 71% is a large percentage, explain why it could be misleading. How can I convert this into standard deviation problem?

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Apr 08, 2012
Sunscreen - Statistics and Claims
by: Staff


Question:

by Sue
(USA)


In a recent article, the author states that 71% of adults do not use sunscreen. Although 71% is a large percentage, explain why it could be misleading. How can I convert this into standard deviation problem?


Answer:


You don’t have enough information to convert this statement into a standard deviation problem.


I have found two threads in our archives which address this question from different points of view.


(1) If your browser is Firefox, click the following link to VIEW the solution; or if your browser is Chrome, Internet Explorer, Opera, or Safari (2A) highlight and copy the link, then (2B) paste the link into your browser Address bar & press enter:

Use the Backspace key to return to this page

http://www.solving-math-problems.com/math-validity-of-percentages-used-in-ads.html

http://www.solving-math-problems.com/math-percentage.html



Thanks for writing.

Staff
www.solving-math-problems.com


Nov 19, 2013

by: Anonymous

The principal at Thatcher Junior High School decided to compare the math skills of students at the school. He gave a prime factorization test to the 8th graders and had a 84% passing rate. He gave an estimation test to the 7th graders and had a 77% passing rate. And he gave an addition test to the 6th graders and had a 89% passing rate. In the end he decided that the 6th grade class was better in math than the 7th and 8th grade classes. Why is his reasoning faulty?

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