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As part of your work for an environmental awareness group, you want to test a claim...

As part of your work for an environmental awareness group, you want to test a claim that the
mean amount of lead in the air in U.S. cities is less than 0.036 microgram per cubic meter.
You find that the mean amount of lead in the air for a random sample of 56 U.S. cities is
0.039 microgram per cubic meter and the standard deviation is 0.069 microgram per cubic
meter. At , is there enough evidence to support the claim?

math   Statistics-And-Probability   
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