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The file couple

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The file couple.csv contains a dataset based on a study of the impact
of education level and level of anxious attachment on unwanted pursuit behaviours in the context of couple separation. The following are the variables.
Variables Description
upb number of unwanted pursuit behaviour perpetrations;
education 1 if at least bachelor’s degree; 0 otherwise;
anxiety continuous measure of anxious attachment
a) Develop an appropriate statistical model for the number of unwanted
pursuit behaviour perpetrations. There is no need to consider any interaction between predictors. You should investigate the data graphically and/or numerically before fitting a model. Use a model selection
criterion to select the best model if needed. For your final model:
i) Write down the fitted model equation.
ii) Interpret the model parameter(s).
iii) Perform diagnostic checking to confirm your final model is appropriate.
b) Inspire by https://youtu.be/s3JldKoA0zw, we are adding two more
cases to the dataset:
upb education anxiety
2 1 0.7425
1 0 -1.0977
Add these 2 cases to your existing dataset and reproduce the whole
analysis you did in part a). Marks will be awarded in this part based
on the correctness of the analysis as well as how similar and consistent
your analysis looks when compared to what you had in part a).
c) Suppose you are now asked to investigate the potential interaction
effect between the two covariates. Investigate the data graphically
and/or numerically. Comment on your output and whether you would
need to adjust your analysis earlier. There is no need to (fit and)
report any extra model(s) with interaction effect.