content area top Part 1 A scientist estimates that the mean nitrogen dioxide level in a city is greater than 28 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 9. At alphaequals0.12, can you support the scientist's estimate? Complete parts (a) through (e). 34 43 32 31 18 28 34 37 26 28 22 26 18 35 28 34 44 42 25 39 28 44 31 39 37 26 37 25 42 40 30 Question content area bottom Part 1 (a) Write the claim mathematically and identify Upper H 0 and Upper H Subscript a. Choose from the following. A. Upper H 0: mugreater than or equals28 (claim) Upper H Subscript a: muless than28 B. Upper H 0: muless than or equals28 (claim) Upper H Subscript a: mugreater than28 C. Upper H 0: muequals28 Upper H Subscript a: mugreater than28 (claim) D. Upper H 0: muless than or equals28 Upper H Subscript a: mugreater than28 (claim) Your answer is correct.E. Upper H 0: muequals28 (claim) Upper H Subscript a: mugreater than28 F. Upper H 0: muless than28 Upper H Subscript a: mugreater than or equals28 (claim) Part 2 (b) Find the critical value and identify the rejection region. z 0equals 1.17 (Round to two decimal places as needed.) Part 3 Rejection region: z greater than 1.17 Part 4 (c) Find the standardized test statistic. zequals 2.69 (Round to two decimal places as nee