You conduct a research study and find that student coffee consumption is strongly related to academic performance. Your study used ____________ strategy.
a. a descriptive
b. an experimental
c. a multivariate
d. a correlational
Dr. Jones is interested in studying how white noise can influence participants' sleep quality. A sample of 100 participants is selected. Fifty of the participants are randomly assigned to the white noise condition where they are instructed to use a white noise machine in their bedrooms during sleep. For the other 50 participants, they are to sleep in their normal noise conditions. Each week for two months, Dr. Jones records the self-reported fatigue levels of the participants in each of the conditions. In Dr. Jones' Study, the independent variable is
a. the noise level of the sleeping conditions
b. the presence or absence of a white noise machine
c. fatigue
d. participants' sleep habits
Dr. Jones is interested in studying how white noise can influence participants' sleep quality. A sample of 100 participants is selected. Fifty of the participants are randomly assigned to the white noise condition where they are instructed to use a white noise machine in their bedrooms during sleep. For the other 50 participants, they are to sleep in their normal noise conditions. Each week for two months, Dr. Jones records the self-reported fatigue levels of the participants in each of the conditions.In Dr. Jones' Study, how many levels of the independent variable are there?
a. 2
b. 100
c. 1
d. 50
Dr. Jones is interested in studying how white noise can influence participants' sleep quality. A sample of 100 participants is selected. Fifty of the participants are randomly assigned to the white noise condition where they are instructed to use a white noise machine in their bedrooms during sleep. For the other 50 participants, they are to sleep in their normal noise conditions. Each week for two months, Dr. Jones records the self-reported fatigue levels of the participants in each of the conditions. Assuming that Dr. Jones' Study uses people from different age groups, participant age would be a(n) ____ variable in the experiment.
a. independent
b. extraneous
c. dependent
d. internal
You want to study to beliefs about parenting in a population of refugees who represent 4% of the total population in the community. You anticipate that their beliefs may differ from native born members of the community. What sampling method is most appropriate for this study?
a. simple random sampling
b. stratified random sampling with oversampling
c. systematic sampling
d. proportionate stratified random sampling
Research usually begins with a question about a ____ but the actual research study is conducted with a ____.
a. nonprobability sample, probability sample
b. population, sample
c. probability sample, nonprobability sample
d. sample, population
If a between-subjects experiment produces 50 scores in treatment 1 and 50 scores in treatment 2, then the experiment must have employed _____ participants.
a. 100
b. 200
c. 25
d. 50
Question 14 A researcher is conducting an experiment to see the effect of classical music and rock music on performance on a math test. She suspects that undergraduate major will influence test scores, so she matches participants based on their major. One of the advantages of using this matched group design is_______________.
a. matching ensures a nonbiased sample.
b. matching eliminates all systematic relationships between participant characteristics and treatment conditions.
c. matching is easier than randomization.
d. matching reduces error due to participant differences on the variable that was used to match and their relation to treatment conditions.