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

Question

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 are equal proportions of subjects abstaining and still smoking in the placebo group. There are equal numbers of subjects abstaining and still smoking. There is no difference in the proportions of subjects abstaining from smoking among the three treatments.

Explanation / Answer

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

H0: There is no difference in the proportions of subjects abstaining and still smoking among the three treatments.

H0: There is a difference in the proportions of subjects abstaining and still smoking among the three treatments.

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