Methods in which research respondents do not have to be disturbed ...

[khang]

Methods in which research respondents do not have to be disturbed for data to be gathered are referred to as _____ methods.
 Fill in the blank(s) with correct word

Question 2

One component of total measurement error is random error, which
 a. causes a constant bias in the measurements
  b. involves a consistent error in the measuring instrument
  c. involves a bias caused by the way sample is selected
  d. involves influences that bias measurements, but not in a systematic way

[laurnthompson]

Answer to Question 1

unobtrusive

Answer to Question 2

D
Random error involves errors and biases in measurement that occur randomly rather than systematically.

[khang]

Gracias!

[nguyenhoanhat]

Thanks for the timely response, appreciate it