Exam 12: Data Analysis and Interpretation: Part Iitests of Statistical Significance and the Analysis Story

A psychologist conducts a study to test a new treatment.The effect of treatment is statistically significant; the effect size is small according to accepted criteria.When considering the practical or clinical significance of the finding,the psychologist is likely to be concerned about

Use the ANOVA Summary Table to answer the question that follow: How many levels are there for Factor A and Factor B?

Results that are "statistically significant" may not be of interest to the scientific community because

Briefly describe the logic of the analysis of variance or F-test for a single-factor random groups design.

A result that is not "statistically significant" means that

Read the following research report and answer the question that follow. A researcher compares men's and women's attitudes toward dating their best friend's former girl/boy friend.Specifically,college students are asked to read a story describing a situation in which their best friend breaks up with a partner and they later have an opportunity to date their best friend's former partner.Men and women rate the likelihood they would choose to date their best friend's former partner using a 10-point scale (0 = not at all likely and 9 = completely likely).In addition,participants rate the extent to which a similar situation has occurred to them using a 10-point scale (0 = not at all and 9 = completely).The mean ratings for each question for the two groups,men and women,are presented below: Were the results statistically significant? Explain your decisions.

The initial overall analysis of an experiment based on the analysis of variance is called

When a finding in an experiment is statistically significant,the scientific community can be confident that

In general,a repeated measures design is likely to be ________ than a random groups design.

Read the following research report and answer the question that follow. A researcher compares men's and women's attitudes toward dating their best friend's former girl/boy friend.Specifically,college students are asked to read a story describing a situation in which their best friend breaks up with a partner and they later have an opportunity to date their best friend's former partner.Men and women rate the likelihood they would choose to date their best friend's former partner using a 10-point scale (0 = not at all likely and 9 = completely likely).In addition,participants rate the extent to which a similar situation has occurred to them using a 10-point scale (0 = not at all and 9 = completely).The mean ratings for each question for the two groups,men and women,are presented below: Describe whether a Type I error and whether a Type II error are possible in this study.

The results of an omnibus F-test for a complex design experiment allow the researcher to

If the omnibus analysis of variance for a complex design reveals a statistically significant interaction effect,the source of the interaction effect may be identified using

A researcher plans to conduct a study to compare two groups.Based on previous research,she anticipates a medium effect size.She does a power analysis with alpha level of .05.This power analysis tells her

If the omnibus analyses of variance for a complex design reveals a statistically significant interaction effect,the source of the interaction effect may be identified using simple main effects analysis and,when there are more than two levels of an independent variable,also

When researchers have a good estimate of the expected effect size for an independent variable prior to conducting a study,they should

The primary way that analysis of variance for repeated measures differs from that for an independent groups design is in the estimation of

The primary factor that researchers use to control the power of a statistical test is

A researcher predicted that an independent variable would produce a difference between a treatment and a control group for the dependent variable.The statistical test resulted in a "statistically significant" difference.This finding

(a)What is a Type I error and what is a Type II error when using NHST? (b)Which is more common in psychological research?

In order to conclude whether the results of an inferential test support the research hypothesis,a researcher must