[問題] 2-way table?
One study assigned stroke patients at random to four treatments.
Here are the data.
Treatment # of patients # of strokes # of deaths
Placebo 1649 250 202
Aspirin 1649 206 182
Dipyridamole 1654 211 188
Both 1650 157 185
Make a two-way table of treatment by whether or not a patient had a
stroke during the two-year study period. Compare the proportion of
strokes for the four treatments. Which treatment appears most
effective in preventing strokes? Test if there is significant
evidence that the four treatments differ in the proportion of patients
who stroke? In what ways do they differ
請問一下這題要怎麼解釋? 光把Frequeny打上也不能解釋第一部分吧?
Placebo 1649 250 15.16%
Aspirin 1649 206 12.49%
Dipyridamole 1654 211 12.76%
Both 1650 157 9.52%
6602 824
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