A scientist estimates that the mean nitrogen dioxide level in a city is greater than 30 parts per billion. To test this estimate, you determine the nitrogen dioxide levels for 31 randomly selected days. The results (in parts per billion) are listed to the right. Assume that the population standard deviation is 11 . At =0.02, 2123412741243534294337 can you support the scientist's estimate? Complete parts (a) through (e). 3728152122173018164123 384228402141144325 (a) Write the claim mathematically and identify H0 and Ha. Choose from the following. A. H0:30 B. H0:30 (claim) C. H0:<30Ha:>30 (claim) Ha:>30Ha:30 (claim) D. H0:30 (claim) E. H0:=30 (claim) F. H0:=30Ha:<30Ha:>30Ha:>30 (claim) (b) Find the critical value and identify the rejection region. z0= (Round to two decimal places as needed.) Rejection region: z (c) Find the standardized test statistic. z= (Round to two decimal places as needed.) (d) Decide whether to reject or fail to reject the null hypothesis. Reject H0 Fail to reject H0.

1. A scientist estimates that the mean nitrogen dioxide level in a city is greater than 30 parts per
billion. To test this estimate, you determine the nitrogen dioxide levels for 31 randomly selected
days. The results (in parts per billion) are listed to the right. Assume that the population standard
deviation is 11 . At =0.02, 2123412741243534294337 can you support the scientist's estimate?
Complete parts (a) through (e). 3728152122173018164123 384228402141144325 (a) Write the
claim mathematically and identify H0 and Ha. Choose from the following. A. H0:30 B. H0:30
(claim) C. H0:<30Ha:>30 (claim) Ha:>30Ha:30 (claim) D. H0:30 (claim) E. H0:=30 (claim) F.
H0:=30Ha:<30Ha:>30Ha:>30 (claim) (b) Find the critical value and identify the rejection region.
z0= (Round to two decimal places as needed.) Rejection region: z (c) Find the standardized test
statistic. z= (Round to two decimal places as needed.) (d) Decide whether to reject or fail to
reject the null hypothesis. Reject H0 Fail to reject H0