Perform the pairwise disjointness test for each of the following grammar rules. Your answer should show the FIRST() function for each RHS, and then state whether the LHS rule passes or fails pairwise disjointness by examining all pairs of RHS FIRST()'s. To get you started, the first RHS is: FIRST(aB) = {a} a. A → aB | b | cBB b. B → aB | bA | aBb c. C → aaA | b | caB

Which of the following methods could be considered a “best practice” in terms of informing respondents how their answers to an on-line survey about personal information will be protected? respondents are informed that investigators will try to keep their participation confidential; however, confidentiality cannot be assured. respondents are informed that a research assistant will transfer all the research data to a password-protected computer that is not connected to the internet, via a usb flashdrive. the computer is located in a research team member’s office. the investigator uses the informed consent process to explain her institution’s method for guaranteeing absolute confidentiality of research data. the investigator uses the informed consent process to explain how respondent data will be transmitted from the website to his encrypted database without ever recording respondents’ ip addresses, but explains that on the internet confidentiality cannot be absolutely guaranteed.

Identify at least three types of characteristics that you were asked about as you the computer identify a fruit.

Acetylene is a gas which burns rapidly on its own, and is considered highly explosive. a) true b) false