A study on motivated skepticism examined whether participant

A study on motivated skepticism examined whether participants were more likely to be skeptical when it served thier self-interest. Niney three participants completed a ficticious medical test that told them they had high levels of a certain enzyme, TAA. Participants were randomly assigned to be told either that high levels of TAA had potentially unhelathy consequences or potentially healthy consequences. They were also randomly assigned to complete a dependent measure before or after the TAA test. The dependent measure assessed their perception of the accuracy of the TAA test on a scale of 1 (very inaccurate) to 9 (very accurate). Ditto and Lpoez found the following means for those who completed the dependent measure before taking the TAA test; unhealthy result, 6.6; healthy result, 6.9. They found the following means for those who completed the dependent measure after taking the TAA test; unhealthy resul, 5.6; healthy result, 7.3. From their ANOVA they reported statistics for two findings. For the main effect of test outcome, they reported the following statistic; F(1,73) = 7.74, p < 0.01. For the interaction of test outcome and timeing of the dependent measure, they reported the following statistic: F(1,73) = 4.01, p <0.05

1. State the independent vairables and their levels.

State the dependent variables

2. What kind of ANOVA would be used to analyze these data? State the name using the original language as well as the more specific language.

3. Use the more specific language of ANOVA to calculate the number of cells in this research design.

4. Draw a table of Cell means, marginal means, and the grand mean. Assume that equal numbers of participants were assigned to each cell (even though this was not the case in the actual study)

5. Describe the significant main effect in your own words

6. Draw a bar graph that depicts the main effect

7/ Why is the main effect misleading by itself?

8.Is the main effect qualified by a statistically significant interaction? Explain. Describe the interaction in your own words.

9. Draw a bar graph that depicts the interaction. Include lines that connect the tops of the bars and show the pattern of the interaction.

Anything will help. I am lost!

Solution

I think the study is for nighty three paticipants . Please confirm.As per the result I think it is 73.

They were told they had high level of enzymes TAA.

Participants were randomly told the consequences of high and low level of TAA.

Participants had to complete before and after dependent measure.

The dependent measure was

1 - inaccurate

9 - very accurate

In this case the independent variabe is the dependent measure and the independnt variable is self interest.

Instead of ANOVA paired t test also can be used if the participants are the same before and after the dependent measure.

p <0.01   we reject the null hypotheis

p<0.05 we reject the null hypothesis

If more information like back ground of the problem is given then some more charts can be drawn