What are the smallest representations that convey meaning and grammatical properties?

Jerilyn is in the early stages of an inoperable cancer. She has prepared a signed and witnessed written document directing her family not to allow any artificial or heroic steps to be taken in the event that she is unable to make her wishes known at

the appropriate time. What is this document called? A) Power of attorney B) Executive trust C) Living trust D) Advance directive

If a researcher has determined that his results are "statistically significant," what does this mean?

a. The results are meaningful and deserve to be published in a scientific journal. b. The results probably did not occur by chance. c. The researcher failed to reject the null hypothesis. d. The researcher should immediately seek a patent for the idea because it is important.