9. The null hypothesis for the chi-square test for this twoway table is S-Adenos

Question

9.

The null hypothesis for the chi-square test for this twoway table is

S-Adenosyl-l-methionine (SAMe) is a dietary supplement used to treat depression. A study randomly assigned smokers who wanted to quit smoking to one of three groups: a low dose of SAMe, a high dose of SAMe, or a placebo. After 8 weeks of treatment and behavioral smoking cessation intervention, smoking abstinence was assessed biochemically. Here are the findings:

The null hypothesis for the chi-square test for this twoway table is

There is no difference in the proportions of subjects abstaining from smoking among the three treatments. There are equal numbers of subjects abstaining and still smoking. There are equal proportions of subjects abstaining and still smoking in the placebo group. Placebo Low-dose SAMe High-dose SAMe Abstinent Still smoking 33 33 35

Explanation / Answer

The null hypothesis for this two way table is:

There is no difference in the proportions of subjects abstaining from smoking among the three treatments.

Option A is correct.

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