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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Assume z is a standard normal random variable. What is the value of z if the area to the right ...