NSE 212 Practice Questions and Answers

NSE 212 Practice Questions and Answers What is the purpose of randomly assigning people to control or experimental groups? Every subject has an equal chance of being included in any group. No systematic bias that may affect dependent variable What is the purpose of giving the experimental group a treatment? Experimenter controls & consciously varies the IV, then observes its effect on DV. This offers a comparison Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:05 / 0:15 Full screen Brainpower Read More Why does the researcher try to control extraneous variables? Group differences that emerge truly related to treatment are observed. Ex. age is controlled through inclusion criteria What are the limitations of experimental research? Some variables are not amenable to manipulation or ethical to do so, making it impractical The researcher randomly assigned post surgical patients to aromatherapy or usual care, to assess effects on nausea. This is an example of: Experimental design Intervention, people were assigned randomly The researcher compared levels of agitation in two groups of nursing home residents, one group living in a home where they received a daily foot massage for 2 weeks, the other in a home without the massages. This is an example of: Quasiexperimental design Intervention, but subjects were not assigned randomly; nonequivalent control group The researcher studied daily pain ratings over a 10-week period for a group of patients with rheumatoid arthritis who began a Tai Chi program in week 5. This is an example of: Quasiexperimental design Intervention, but only one group was without any randomization; time series The researcher compared pregnant women who did or did not have a miscarriage in terms of subsequent marital satisfaction. This is an example of: Nonexperimental design No intervention. Women could not be assigned at random to a miscarriage; cohort design The researcher compared patients who were assigned at random to a program to manage urinary incontinence or in a waitlist group who received the program 6 months later. This is an example of: Experimental design Intervention, people were assigned randomly A researcher was interested in examining the relationship between hours of sleep and test scores in nursing students. This is an example of: Nonexperimental design Test of relationships (correlation), no manipulation of IV A research team plans to study the effect of play therapy rooms on children's mood. Patients on unit A and D will be exposed to the play therapy rooms. Patients on unit F and H will not be exposed to the play therapy room. This is an example of: Quasiexperimental design No randomization. There is a comparison group; nonequivalent control group design When a sample contains different characteristics that are important to capture, which sampling approach should be used to select participants? Stratified random sampling More than one characteristic to be selected A researcher is interested in the satisfaction of BScN students in the collaborative program. Which approach to sampling would lead to the most representative option? Simple random sampling The researcher randomly assigned 50 men and 50 women smokers who responded to a recruitment notice to a smoking cessation intervention or to a control group. This is an example of: Nonprobability sampling First random selection occurs, then random assignment The researcher sampled every 25th nurse on a roster of licensed nurses in Florida to study their use of personal digital assistants. The starting # of 12 was selected at random. This is an example of: Probability sampling Systematic The researcher randomly assigned 152 elders recruited from five nursing homes to a foot massage or a wait list group to assess effects on level of depression. This is an example of: Nonprobability sampling The researcher randomly selected 250 students from a large university to study their use of alcohol. This is an example of: Probability sampling You are setting up the significance for a study and you realize that there is very limited number of studies on this topic. What is the likely significance level you would select? a) 0.05 b) 0.01 c) 0.001 a) 0.05 Conservative You conduct a study and realize that there is no statistically signiciance differences in the groups that you observed. What are the likely reasons? a) The significance was set too low b) The sample size was 30 c) The measurement tools were valid and reliable d) The Power analysis was not done e) You are new to your field a) The significance was set too low b) The sample was 30 d) The Power analysis was not done You are looking at how well you did in an exam in comparison to a college in another class using the same exam. What is needed to really compare the scores from 2 different groups? a) Having the mean and SD for each group b) Having the individual scores c) Comparing the means d) Using a statistical test e) Converting each score into z score b) Having the individual scores d) Using a statistical test e) Converting each score into z score A college health center identifies a lack of testicular self-examination among students and implements an intense summer wellness program focusing on the benefits of testicualr self-examination. Afterward, a count indicates an increased number of students who DO NOT complete testicular self-examination. Which internal validity threat is suspected? a) History b) Maturation c) Testing d) Mortality e) Selection bias A nurse researcher is investigating the effects of yoga and blood pressure. One group of subjects is participating in a yoga class and the other group is not. Which type of research design should be used? a) Qualitative b) Correlational c) Meta analysis d) Experimental Authors did not address reliability or validity of either of their data collection tools. This: a) implies the tools are valid and reliable b) is fairly typical of most studies c) implies tools are not valid and reliable d) is a limitation as there should be some mention of an instrument's psychometric properties d) is a limitation as there should be some mention of an instrument's psychometric properties Authors note that calculations were made, a Power Analysis was done, to estimate sample size. This information tells us that a) the results of the study will be valid b) the data obtained from the study will be reliable c) there is almost no risk of error in the study results d) the sample size will reduce the risk of a type 2 error d) the sample size will reduce the risk of a type 2 error Likelihood of making a type 2 error reduces as we increase sample size. Power Analysis determines sample size