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Ten years ago, it was found that only 28% of manufacturing companies believed that their operations...

Ten years ago, it was found that only 28% of manufacturing companies believed that

their operations had a negative environmental effect. In a more recent survey, 127 out of 250

companies indicated that they believe their operations have a negative effect on the environment.

Conduct a hypothesis test at the 5% level of significance to determine if there is evidence that

the proportion increased from the previous 28%.

Math   Statistics-And-Probability   
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