A manufacturer of detergent claims that the contents of boxes sold weigh on average at least 32 ounces. The distribution of weight is known to be normal, with a standard deviation of 0.4 ounces. A random sample of 25 boxes yielded a sample mean weight of 31.61 ounces, Test of the 1%% significance level the null hypothesis that the population mean weight is at least 32 ounces. OA. Hop a 32 O B. Ho: ( = 32 Hu# 32 O C. Ho: H = 32 O D. Ho: HIS 32 H, = 31.61 Hi HI> 32 For this test at the significance level a with sample mean x, hypothesized mean po population standard deviation o, sample size n, and Z, of Za /2, what is the form of the decision rule? x - Po X -Vo O A. Reject Ho if Za x - Po O C. Reject Ho if-