REGRESSION AND CORRELATION ANALYSIS

QUESTION

1. 1.           What type of research design best describes the comparison on EEG activity? Explain your answer.               (2 marks)
2. 2.           Comment briefly on the main variables that might need to be controlled for when making group comparisons here.

(2 marks)

1. 3.           For the ADHD group only, present a histogram that shows the distribution of scores for EEG activity.  Comment on whether this plot appears to be normally distributed.

(3 marks)

1. 4.           Generate descriptive statistics (means and standard deviations) for each group and the total sample on EEG activity and vocabulary. Present these results in a table.

                        (6 marks)

1. 5.           Present a bar chart that compares the performance of the three groups on vocabulary.  (Include error bars). Comment on the apparent differences between groups.
   (4 marks)
2. 6.           Tabulate (i.e., provide a table) changes in mean levels of maladaptive behaviour for each group.  Comment on the pattern of group differences.
   (3 marks)
3. 7.           For each group, calculate the correlation between EEG activity and vocabulary. Present scatterplots showing this relationship in each group. (Note the range of the axes on all graphs should be the same – you will to adjust using the Chart Editor function). Comment on whether there appear to be any outliers (hint: for one the groups, this does appear to be the case).  For the group in question, remove the obvious outlier(s) and re-calculate the correlation (citing the participant number removed). Comment on any change in correlation with the outlier removed.

(6 marks)

8.       For the total sample, does there appear to be a gender difference on baseline (or Time 1) levels of maladaptive behaviour?  Present the results of this “eye-ball” analysis (i.e., provide a boxplot). Comment on any differences in the boxplots.

SOLUTION

Answer 1

There are three types of groups namely ADHD, Autism, and typically developing children. We want to compare the three types of children using EEG. We compare the children by using descriptive statistics, correlation, and regression analysis and using some diagrams like Histogram, Bar diagram etc.

Answer 2

In this dataset  the main variables are EEG, group and verbal ability because EEG measured over the prefrontal cortex while they complete a test of response inhibition, the Go-NoGo Task. High scores on this task indicate greater levels of activity.  Verbal ability is measured on a test of vocabulary. Group indicates the comparison between three groups. So, EEG and Vocabulary test  are the key variables.

Answer 3

For the ADHD group I present a histogram that shows the distribution of scores for EEG activity.

Answer 4

Here  we generate a descriptive statistics for the three groups and the total sample on EEG activity and vocabulary and it represents in a table below. Here we include number of observations, mean and standard deviations for three groups of EEG and Vocabulary and we mention total result also.

TABLE: MEAN AND STANDARD DEVIATION FOR THREE GROUPS OF EEG AND VOCABULARY

Answer 5:

Here I present a bar chart that compares the performance of the three groups on vocabulary.  (Include error bars).

First bar represents the mean verbal ability for the group ADHD and also show the error bars with 95% confidence interval.

Second bar represents the mean verbal ability for the group Autism and also show the error bars with 95% confidence interval.

Third bar represents the mean verbal ability for the group Control and also show the error bars with 95% confidence interval.

Here we see that Control group provides good scores comparably to other two groups. But ADHD and Autism provide almost same scores.

Answer  6:

Here I create table for changes in mean levels of maladaptive behavior for each group. In this dataset maladaptive scores are recorded at 4 different time points. I consider here in the table below the mean difference of scores for three groups at the 4 time points. The difference and the significance are mentioned briefly at the table below.

Answer 8:

Here we show the gender difference into the three groups of maladaptive behavior  at time point 1.

JC18

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