(Answered) Question biology and environmental science carbon dioxide

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Question: Biology and Environmental Science Carbon dioxide (CO₂) is one of the primary gases contributing to the greenhouse effect and global warming. The mean amount of CO₂ in the atmosphere for March 2013 was 397.34 parts per million (ppm).13 Suppose 40 atmospheric samples are selected at random in May 2013 and the standard deviation for CO₂ in the atmosphere is σ = 20 ppm.

a. Find the probability that the sample mean CO₂ level is less than 393 ppm.

b. Find the probability that the sample mean CO₂ level is between 395 and 403 ppm.

c. Suppose the sample mean CO₂ level is 400. Is there any evidence to suggest that the population mean CO2 level has increased? Justify your answer.

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