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Author Question: Which of the following statements is true about stratified random sampling? a. Allows the ... (Read 16 times)

Mr3Hunna

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on: Jul 8, 2018
Which of the following statements is true about stratified random sampling?
 
  a. Allows the researcher to use a smaller sample size
  b. Ensures obtaining a larger sample at lower cost
  c. Internal validity is strengthened with this type of sampling
  d. Involves the selection of certain subjects from a convenience sample

Question 2

The term comparison group in research refers to the group of patients in a:
 
  a. nonrandom sample who do not receive a treatment.
  b. nonrandom sample who receive a treatment.
  c. random sample who do not receive a treatment.
  d. random sample who receive a treatment.


Koolkid240

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Reply #1 on: Jul 8, 2018
Answer to Question 1

ANS: A
With stratification, the researcher can use a smaller sample size and achieve the same degree of representativeness in relation to the stratified variable as a large sample acquired through simple random sampling.
There is no assurance of a larger sample.
Internal validity is not necessarily strengthened with stratified random sampling over random sampling.
Subjects are still selected through a probability process.

Answer to Question 2

ANS: A
If nonrandom methods are used for sample selection, the group not receiving a treatment is referred to as a comparison group.
Subjects in the group that receive a treatment are called the treatment or experimental group. If nonrandom methods are used for sample selection, the group not receiving a treatment is referred to as a comparison group.
Subjects drawn from a random sample who do not receive a treatment are called the control group. If nonrandom methods are used for sample selection, the group not receiving a treatment is referred to as a comparison group.
Subjects in the group that receive a treatment are called the treatment or experimental group. If nonrandom methods are used for sample selection, the group not receiving a treatment is referred to as a comparison group.


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Mr3Hunna

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Reply #2 on: Jul 8, 2018
Thank you


Koolkid240

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Reply #3 on: Jul 8, 2018
No problemo


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