2. A simple random sample of 30 ears of corn is collected from a field. The ears of corn have a mean weight of 0.21 kg with a standard error of the mean of 0.006. Which of the following should be used...

Extracted text: 2. A simple random sample of 30 ears of corn is collected from a field. The ears of corn have a mean weight of 0.21 kg with a standard error of the mean of 0.006. Which of the following should be used to compute an 80% confidence interval for the mean weight of all the field's ears of corn? (A) 0.21±0.854(0.006) 0.006 (B) 0.21 ±0.854 V30 (C) 0.21±1.311(0.006) 0.006 (D) 0.21±1.311 T30 0.006 (E) 0.21 ±1.96 J30