Question: The EPA wants to show that the mean carbon monoxide level of air pollution is higher than 4.9. Does a random sample of 22 readings (mean = 5.1, s = 1.17) present sufficient evidence to support the EPA's claim?
use alpha = .05 (such readings are normal distributions)

a. State the null and alternate hypotheses.
b. Calculate the t test statistic
c. find the critical values and critical regions
d. state the conclusion
e. approximate the p-value for this test