The campaign staff legislator wants to determine whether the legislator's performance rating (on a scale of O to 100) has increased from last year to this year. The legislator's performance ratings from the same 16 randomly selected voters are recorded for last year and this year. Research question: Has the legislator's performance rating increased? What are the appropriate null and alternative hypotheses? Assume that the difference is computed as this year's rating minus last year's rating. Ho : #d - 0 Ha : He 20 O Ho : #2 70 Ha :pa - 0 O Ho : #2 20 Ha : Pa - 0 O Ho : Ha = 0 Ha : He >0