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Author Question: Selection bias can occur if volunteers only are used in a study. 1.True ... (Read 27 times)

Pea0909berry

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on: Jul 24, 2018
Selection bias can occur if volunteers only are used in a study.
  1.True
  2.False

Question 2

A study is an observational study if the investigator observes the behavior of a response variable when one or more factors are manipulated.
  1.True
  2.False


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blakeserpa

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Reply #1 on: Jul 24, 2018
Answer to Question 1

1

Answer to Question 2

2


Pea0909berry

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Reply 2 on: Jul 24, 2018
Gracias!

amandanbreshears

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Reply 3 on: Yesterday
Wow, this really help

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