Which of the following statements is true about stratified random ...

[Mr3Hunna]

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]

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.

[Mr3Hunna]

Thank you

[Koolkid240]

No problemo