Exam 15: Glm 4: Repeated-Measures Designs

When sphericity is violated, what test statistics should be used?

The following result is reported for a study by Kain et al. (2008) on the number of parents who should be let into the operating room. In respect of parental anxiety along two time points (holding area and separation from children) a two-way ANOVA with repeated measures evaluation was performed with the following result in relation to group × time interaction: F(1,95) = 7.78, p = 0.006. In the one-parent group versus the parents in the two-parent group the result is shown as 48.6 + 13.1 vs. 39.7 +11.5, p < 0.02. (Source: Kain, Z. N., MacLaren, J., Weinberg, J., Huszti, H., Anderson, C., & Mayes, L. (2009). How many parents should we let into the operating room? Paediatric Anaesthesia, 19(3), 244-249.) What does this result mean?

An experiment was carried out in which participants learned words in several conditions: no learning strategy, a verbal learning strategy, a visual one and a verbal-visual one. What considerations would the researchers not need to take into account?

In a study examining attitudes to ethnic minorities the following output was obtained via SPSS. Assuming sphericity, how would the result be reported?

The following SPSS output represents three conditions (based on groups of individuals capacity to undertake a specific test in relation to computer use) and sphericity has not been violated. How would the difference between conditions be reported? Source:http://www.lifesci.sussex.ac.uk/home/Zoltan_Dienes/RM%20II%20SPSS%20repeated%20measures.doc

Which of the following statements about the assumption of sphericity is not true?

In the output below, what does Mauchly's test of sphericity indicate? Source:http://www.lifesci.sussex.ac.uk/home/Zoltan_Dienes/RM%20II%20SPSS%20repeated%20measures.doc

In the analysis of the table below, the SS are all the same no matter which sphericity correction is applied. This means

The Greenhouse-Geisser correction refers to

In a study examining attitudes to ethnic minorities the following output was obtained via SPSS. In relation to this same experiment and the SPSS output detailed below, what does the information in the following box plot demonstrate?

What is not an advantage of repeated-measures designs in comparison to independent measures designs?

When the assumption of sphericity is violated what action is needed?

In terms of Mauchly's test of sphericity, what does the table below indicate?

If there is sphericity in a repeated-measures design the outcome could be that

In a repeated-measures design with one factor of four levels and three participants, what are the residual degrees of freedom?

If sphericity is to be an issue in a repeated-measures design, what is the minimum number of conditions required?

When repeated measures are used, which assumption is violated?

A nutritionist conducted an experiment on memory for dreams. She wanted to test whether it really was true that eating cheese before going to bed made you have bad dreams. Over three nights, the nutritionist fed people different foods before bed. On one night they had nothing to eat, a second night they had a big plate of cheese, and the third night they had another dairy product, milk, before bed. All people were given all foods at some point over the three nights. The nutritionist measured heart rate during dreams as an index of distress. How should these data be analysed?

Which of the following is not a source of variability in repeated-measures ANOVA

An experiment was carried out in which participants learned words in several conditions: no learning strategy, a verbal learning strategy, visual one and a verbal-visual one. What safeguard could the researchers put in place to overcome the difficulties with repeated measures?