A scientist estimates that the mean nitrogen dioxide level in a city is greater than 26 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 a = 0.13, can you support 27 30 30 37 21 39 28 18 36 34 18 the scientist's estimate? Complete parts (a) through (e). 33 42 33 36 37 27 23 21 34 16 21 41 20 40 24 43 16 29 39 29 (a) Write the claim mathematically and identify Ho and Ha . Choose from the following. O A. Ho: H 26 (claim) Ha: H > 26 (claim) O D. Ho: H= 26 (claim) O E. Ho: HS 26 (claim) OF. Ho: H2 26 (claim) Ha: H > 26 Ha: H > 26 Ha: H