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Question:

Migraine is a neurological disorder, characterised by moderate-to-severe headache and accompanying features, and it is known that obesity is associated with increased migraine risk and severity. Based on this, a study investigated whether a behavioral weight loss (BWL) intervention could decrease headaches from migraine. Women aged 18 to 50 years old, with at least 4 days of migraine headache per month and a BMI of at least 25 kg/m², were randomly allocated to four months in one of two groups: BWL, which targeted exercise and eating behaviors for weight loss, or a migraine education (ME) control, which delivered instruction on migraine and treatments. Each day participants used a web-based headache diary to record if they had experience a migraine headache that day.

Question 8 What is the ){2 statistic used to test for an association between education level and treatment group? O 3.06 o 8.45 O 9.39 O 1126 Question 9 Based on this analysis, you can conclude that there is 0 no evidence to suggest that there is an association between education level and treatment group (p = 0.113) 0 weak evidence to suggest that there is an association between education level and treatment group (p = 0.054), so the researchers should be concerned about their random allocation of subjects to the two groups 0 strong evidence to suggest that there is an association between education level and treatment group (p = 0.005), so the researchers should be concerned about their random allocation of subjects to the two groups 0 strong evidence to suggest that there is an association between education level and treatment group (p = 0.009), so the researchers should be concerned about their random allocation of subjects to the two groups I Question 10 Turning to the research question, and ignoring any concerns from Question 9, what is the mean reduction in the number of headache days for subjects in the study between the first month and the fourth month? 0 3.00 days 0 3.38 days O 350 days 0 5.84 days Question 11 What is the value of the t statistic to test that subjects in the BWL group tend to have a higher mean reduction in headache days? 0 0.600 1591 3'334 000 17,811