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. It was found that the mean amount of lead in the air for the random sample of 54 U.S....

Test a claim that the mean amount of lead in the air in U.S. cities is less than

microgram per cubic meter. It was found that the mean amount of lead in the air for the random sample of

U.S. cities is

microgram per cubic meter and the standard deviation is

microgram per cubic meter. At

can the claim be​ supported? Complete parts​ (a) through​ (e) below. Assume the population is normally distributed.

(d) Decide whether to reject or fail to reject the null hypothesis.

because the standardized test statistic

in the rejection region.

​(e) Interpret the decision in the context of the original claim.

There

enough evidence at the

level of significance to

the claim that the mean amount of lead in the air in U.S. cities is


microgram per cubic meter.

​(Type integers or decimals. Do not​ round.)