Men with prostate cancer were randomly assigned to undergo surgery (n = 347) or "watchful waiting" (no surgery, n = 348).Over the next two years there were 83 deaths in the group that received surgery and 106 deaths in the "watchful waiting" group.The researchers were interested in testing whether there was an association between treatment type, and survival

The observed number of individuals in each of the four possible treatment/outcome combinations is shown below.Calculate the expected number of individuals in each combination under the null hypothesis that there is no association between treatment type, and survival and add these values to the table.

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