Which statement is MOST nearly accurate about the reliability of data sources, in-struments to ...

Which statement is MOST nearly accurate about the reliability of data sources, in-struments to collect data, and the data itself?
 a. A mother is a more reliable data source than a father for information about an infant's daytime sleeping patterns.
  b. When two researchers interview an individual at two different times and get es-sentially the same answers from the interviewee, the interview guide(instrument) has equivalent reliability.
  c. When two researchers interview an individual at two different times and get es-sentially the same answers from the interviewee, the interview guide has stabili-ty.
  d. When two researchers interview an individual at two different times and get es-sentially different answers from the interviewee, the interview guide has stabili-ty.

Ques. 2

Identify the preposition or prepositions in the sentence. Some people left after the first act.

Ques. 3

Crystal, a special events coordinator for the American Heart Association, is visiting Henderson Middle School to kick off a campaign called Jump Rope for Heart. She is in a gymnasium speaking to 300 11-year-old students without the aid of a microphone. Which particular vocal quality might be a concern?
 a. Dialect
  b. Pitch
  c. Volume
  d. Rate

Ques. 4

Which statement is MOST nearly accurate about the validity of data sources, instru-ments to collect data, and the data itself?
 a. Criterion-related validity is a concern only when testing employees for employ-ment.
  b. Data gathered from a national sample possess a greater degree of validity than data collected from a local sample.
  c. Valid instruments are able to detect true differences among the people or objects being measured.
  d. Validity is a concept that applies to data only, not to sources or instruments.