Research Meth.
If an investigator changes the level of significance for his research study from .01 to .001, he is
What is less likely to incorrectly reject a true null hypothesis (increase Type 2 error)
To determine if there is a statistically significant pattern in the effect of time on memory for a list of nonsense syllables, you have subjects memorize a list of 15 syllables and then test their memory at 15-minute intervals for the next two hours. The best technique for analyzing the data you have collected i
What is using a Trend Analysis
When using the analysis of variance, calculation of the F-ratio involves
What is comparing between-group variability to within-group variability
__________________ is a threat to a study's internal validity that occurs as the result of systematic changes within participants during the course of the study that are a function of the passage of time.
What is Maturation
When assessing the reliability and validity of a job selection test, your sample includes current employees who are all doing fairly well on the job. The nature of your sample will most likely have which of the following effects
What is a deflated reliability and validity coefficient
You conduct a research study to compare the effects of four weight-loss programs. To compare the average weight lost by participants in the four groups, you could conduct either a series of t-tests or a one-way ANOVA. You decide to use the one-way ANOVA because its use
What is a decrease in the likelihood that you will make a Type I error
would be that the mean population score is not the same for students who have not received the intervention (researchers do not know the exact value- just that is is not equal)
What is an alternative hypothesis
When conducting a research study to test the effects of two weight reduction programs on weight loss, you decide to match participants in terms of age, weight, and socioeconomic status before you assign them to groups. By doing this, you are
What is controlling for systematic variance (extraneous variables)
A school psychologist wants to determine if there is a significant difference in reading readiness scores between male and female students in the school's preschool program. She obtains scores on a standardized reading readiness test for 17 girls and 13 boys. Which statistical test will be most appropriate for determining if there is a significant difference between the scores obtained by boys and girls?
What is a T-Test
What would be most useful statistic for combining the results of several research studies that each evaluated the effectiveness of the same treatment for a particular disorder
What is the effect size
implies that the IV does not have an effect on the DV
What is the Null hypothesis
When evaluating a treatment for children with serious behavioral disorders, to overcome the ethical problems associated with the use of a wait-list control group, the best research design would be which of the following?
What is a single-subject
A researcher conducts an experiment to determine if Treatment A is more effective than Treatments B, C, and D for reducing cigarette smoking. The researcher randomly assigns 200 volunteers to one of the four treatment groups (A, B, C, or D). Treatment outcome is assessed by comparing the mean number of cigarettes smoked by participants in each group 30 days after completing their treatment programs. The best statistical test for analyzing the data collected in this study would be which of the following?
What is a one-way analysis of variance
Dr. R. E. Medy compares the effectiveness of three different treatments for Generalized Anxiety Disorder by randomly assigning individuals who have received this diagnosis to one of the three treatments and then measuring their symptoms before treatment and one week, one month, and six months following treatment. The research design used by Dr. Medy is an example of which of the following?
What is a mixed study
What statistical test is appropriate for data with two or more dependent variables and one or more independent variables.
What is a MANOVA
A distribution of scores has a mean of 110 and a standard deviation of 10. Adding 12 points to each score in the distribution will
What is an increase the mean by 12 but have no effect on the standard deviation.
False positive result. Rejecting H0 when H0 is true. The chance of this occurring is equal to α
What is Type 1 error