QUESTION 1

Imagine we took a group of smokers, recorded how many cigarettes they smoked each day and then split them randomly into one of two 6-week interventions; 'hypnosis' or 'nicotine patch'. After the 6 weeks, we again recorded how many cigarettes they smoked each day and subtracted this number from the number of cigarettes they each smoked pre-intervention, to produce a intervention success score for each participant. Out of the following options, which would be the best method of displaying the results?

a.A simple bar chart with the variable 'intervention method' on the y-axis and 'intervention success' on the x-axis.

b.A simple boxplot with the variable 'intervention method' on the x-axis and 'intervention success' on the y-axis.

c.A clustered boxplot with 'intervention success' on the y-axis and 'intervention method' on the x-axis

d.A simple boxplot with the variable 'intervention method' on the y-axis and 'intervention success' on the x-axis.

1 points

QUESTION 2

Looking at the graph below, which intervention was the most successful at reducing the number of cigarettes smoked each day in those who wanted to quit?

\fMean Success of Smoking Intervention 0.75- 0.50- 0.25- 0.00- -0.25- -0.50- Yes No Did they want to quit Smoking? Error Bars: 95% CIMean Number of Cigarettes smoked per Day Post Intervention HH 3- H 2- No yes Did they want to quit? Error Bars: 95% CINumber of Cigarettes smoked per Day Post Intervention 0" N 0 2 4 6 8 10 Number of Cigarettes smoked per Day Pre Intervention R2 Linear - 0.206 Intervention Nicotine Hypnosis Prior Intervention Number of Cigarettes per 10- -10 8- -8 - 6 Day Day 2- - 2 Prior Intervention Number of Cigarettes per 20.0 15.0 10.0 5.0 0.0 5.0 10.0 15.0 20.0 Frequency FrequencyMean Prior - post number of cigarettes per day Did 1.50- they want to quit No 1.00- yes 0.50- 0.00- -0.50- -1.00- -1.50 Nicotine Hypnosis Type of Intervention Error Bars: 95% CI