Testing a Claim using Significance
Testing
Test the given claim – Global
warming survey:
A Pew research poll was conducted
to investigate opinions about global warming. The respondents who answered yes
when asked if there is solid evidence that the earth is getting warmer were
then asked to select a cause of global warming. The results for two age
brackets are given in the table below. Use a 0.01 significance level to test
the claim that the age bracket is independent of the choice for the cause of
global warming. Do respondents from both age brackets appear to agree, or is
there a substantial difference?
Human activity Natural patterns
Don’t know
Under 30 108 41 7
65 and over 121 71 43
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